Answer: No, the percentage of the fleet out of compliance is not different from their initial thought.
Step-by-step explanation:
Since we have given that
n = 22
x = 5
So, [tex]\hat{p}=\dfrac{x}{n}=\dfrac{5}{22}=0.23[/tex]
he company initially believed that 20% of the fleet was out of compliance. Is this strong evidence the percentage of the fleet out of compliance is different from their initial thought.
so, p = 0.2
Hypothesis would be
[tex]H_0:p=\hat{p}\\\\H_a:p\neq \hat{p}[/tex]
So, the t test statistic value would be
[tex]t=\dfrac{\hat{p}-p}{\sqrt{\dfrac{p(1-p)}{n}}}\\\\\\t=\dfrac{0.23-0.20}{\sqrt{\dfrac{0.2\times 0.8}{22}}}\\\\\\t=\dfrac{0.03}{0.085}\\\\t=0.353[/tex]
Degree of freedom = df = n-1 = 22-1 =23
So, t{critical value} = 2.080
So, 2.080>0.353
so, we will accept the null hypothesis.
Hence, No, the percentage of the fleet out of compliance is not different from their initial thought.
Final answer:
A hypothesis test can be conducted to determine whether the percentage of the fleet out of compliance is different from the initial belief of 20% by using a null hypothesis of p = 0.20 and an alternative hypothesis of p ≠ 0.20, followed by a Z-test for proportions.
Explanation:
To determine whether there is strong evidence that the percentage of the fleet out of compliance is different from the company's initial belief of 20%, we should set up a hypothesis test. The null hypothesis (H₀) is that the true proportion of cars that are out of compliance is equal to 20% (H₀: p = 0.20). The alternative hypothesis (Ha) is that the true proportion of cars that are out of compliance is different from 20% (Ha: p ≠ 0.20).
Using the sample data of 5 failures out of 22 tested, a statistical test such as the Z-test for proportions can be conducted to determine if we should reject the null hypothesis. This would involve calculating the test statistic comparing the sample proportion to 0.20 and then finding the p-value to make a decision based on the chosen significance level, usually 0.05. If the p-value is below the significance level, we would reject the null hypothesis, indicating that there is evidence that the percentage of the fleet out of compliance is different from 20%.
Building A has 7,500 ft.² of office space for 320 employees. Building B has 9500 ft.² of office space for 317 employees. Which building has more square feet of space per employee? Explain.
Answer:
The square feet of space per employee is more in building B .
Step-by-step explanation:
Given as :
The office space of building A = 7,500 ft²
The number of employee in building A = 320
Let The space in building A per square feet per employee = x ft²
So, x = [tex]\dfrac{\textrm office space in building A}{\textrm number of employee in building A}[/tex]
I.e x = [tex]\frac{7500}{320}[/tex]
∴ x = 23.43 per square feet per employee
So, For building A 23.43 per square feet per employee
Again ,
The office space of building B = 9,500 ft²
The number of employee in building B = 317
Let The space in building B per square feet per employee = y ft²
So, y = [tex]\dfrac{\textrm office space in building B}{\textrm number of employee in building B}[/tex]
I.e y = [tex]\frac{9500}{317}[/tex]
∴ y = 29.96 per square feet per employee
So, For building B 29.96 per square feet per employee
So , from calculation it is clear that the square feet of space per employee is more in building B .
Hence The square feet of space per employee is more in building B . Answer
1. In triangle XYZ, A is the midpoint of XY, B is the midpoint of YZ, and C is the midpoint of XZ. Also, AY = 7, BZ = 8, and XZ = 18. What is the perimeter of triangle ABC? (SHOW WORK)
2. What is y? (SHOW WORK) 2nd picture is the triangle.
Answer:
Part 1) The perimeter of triangle ABC is 24 units
Part 2) [tex]y=97\°[/tex]
Step-by-step explanation:
Part 1) we know that
The Midpoint Theorem states that the segment joining two sides of a triangle at the midpoints of those sides is parallel to the third side and is half the length of the third side
see the attached figure to better understand the problem
so
Applying the midpoint theorem
step 1
Find the value of BC
[tex]BC=\frac{1}{2}XY[/tex]
[tex]XY=2AY[/tex] ---> because A is the midpoint
substitute the given value of AY
[tex]XY=2(7)=14\ units[/tex]
[tex]BC=\frac{1}{2}(14)=7\ units[/tex]
step 2
Find the value of AC
[tex]AC=\frac{1}{2}YZ[/tex]
[tex]YZ=2BZ[/tex] ---> because B is the midpoint
substitute the given value of BZ
[tex]YZ=2(8)=16\ units[/tex]
[tex]AC=\frac{1}{2}(16)=8\ units[/tex]
step 3
Find the value of AB
[tex]AB=\frac{1}{2}XZ[/tex]
substitute the given value of XZ
[tex]AB=\frac{1}{2}(18)=9\ units[/tex]
step 4
Find the perimeter of triangle ABC
[tex]P=AB+BC+AC[/tex]
substitute
[tex]P=9+7+8=24\ units[/tex]
Part 2) Find the measure of angle y
step 1
Find the measure of angle z
we know that
The sum of the interior angles in a triangle must be equal to 180 degrees
so
[tex]55\°+42\°+z=180\°[/tex]
solve for z
[tex]97\°+z=180\°[/tex]
[tex]z=180\°-97\°[/tex]
[tex]z=83\°[/tex]
step 2
Find the measure of angle y
we know that
[tex]z+y=180\°[/tex] ----> by supplementary angles (form a linear pair)
we have
[tex]z=83\°[/tex]
substitute
[tex]83\°+y=180\°[/tex]
solve for y
[tex]y=180\°-83\°[/tex]
[tex]y=97\°[/tex]
To rent a certain meeting room, a college charges a reservation fee of 39 and an additional fee of 5.90 per hour. The film club wants to spend less than 74.40 on renting the meeting room. What are the possible amounts of time for which they could rent the meeting room? Use t for the number of hours the meeting room is rented, and solve your inequality for t.
Answer:
The answer is 6 hours
Step-by-step explanation:
The inequality
39 + 5.90 *t < 74.40 - 39
5.90 *t <35.4
t< 35.4/5.9
= 6 hours
From a group of 8 volunteers, including Andrew and Karen, 4 people are to be selected at random to organize a charity event. What is the probability that Andrew will be among the 4 volunteers selected and Karen will not?A. 3/7
B. 5/12
C. 27/70
D. 2/7
E. 9/35
Answer:
Option D - [tex]\frac{2}{7}[/tex].
Step-by-step explanation:
Given : From a group of 8 volunteers, including Andrew and Karen, 4 people are to be selected at random to organize a charity event.
To find : What is the probability that Andrew will be among the 4 volunteers selected and Karen will not?
Solution :
Choosing 4 people out of 8 volunteers is [tex]^8C_4[/tex]
[tex]^8C_4=\frac{8!}{4!(8-4)!}[/tex]
[tex]^8C_4=\frac{8\times 7\times 6\times 5\times 4!}{4!\times 4\times 3\times 2}[/tex]
[tex]^8C_4=70[/tex]
Choosing a group of 4 with Andrew and no karein is given by,
One position is fixed by Andrew and Karein the number of volunteer left is 6.
Rest 3 volunteers is chosen from 6.
Choosing 3 people out of 6 volunteers is [tex]^6C_3[/tex]
[tex]^6C_3=\frac{6!}{3!(6-3)!}[/tex]
[tex]^6C_3=\frac{6\times 5\times 4\times 3!}{3!\times 3\times 2}[/tex]
[tex]^6C_3=20[/tex]
The probability that Andrew will be among the 4 volunteers selected and Karen will not is given by,
[tex]P=\frac{^6C_3}{^8C_4}[/tex]
[tex]P=\frac{20}{70}[/tex]
[tex]P=\frac{2}{7}[/tex]
The probability that Andrew will be among the 4 volunteers selected and Karen will not is [tex]\frac{2}{7}[/tex].
Therefore, option D is correct.
the length of a rectangular piece of land is 5ft more than two times it’s width. the perimeter is 34ft. find it’s dimensions
Answer: Length = 11 feet
Width = 6 feet
Step-by-step explanation:
A rectangle is a four sided shape that has 2 equal lengths,L and 2 equal widths,W
The perimeter of the rectangular piece of land is the total distance around it. It is expressed as
Perimeter = 2L + 2W = 2(L+W)
The perimeter is given as 34ft. It means that
34 = 2(L+W) - - - - - - - -1
The length of the rectangular piece of land is 5ft more than two times its width. It means that
L = W + 5
Substituting L = W + 5 into equation 1, it becomes
34 = 2(W + 5 +W) = 2(2W + 5)
2W + 5 = 34/2 = 17
2W = 17 - 5 = 12
W = 12/2 = 6 feet
L = W + 5 = 6+5
L = 11 feet
Let X equal the weight in grams of a "52-gram" snack pack of candies. Assume that the distribution of times is N(mu, 6). A random sample of n = 10 observations of x yielded the following data: 55.95 56.54 57.58 55.13 57.48 56.06 59.93 58.30 52.57 58.46
a. Give a point estimate for mu.
b. Find the endpoints for a 95% confidence interval for mu. lower bound_______upper bound______.
c. On the basis of these very limited data, what is the probability that an individual snack pack selected at random is filled with less than 52 grams of candy?
Answer:
a) [tex]\bar x= 56.8[/tex]
b) The 95% confidence interval is given by (55.282;58.318)
c) [tex]P(X<52) = P(Z<\frac{52-56.8}{\sqrt{6}})=P(Z<-1.96) = 0.025[/tex]
Step-by-step explanation:
1) Notation and definitions
n=10 represent the sample size
[tex]\bar X[/tex] represent the sample mean
[tex]s[/tex] represent the sample standard deviation
[tex]\sigma^2= 6[/tex]
m represent the margin of error
Confidence =95% or 0.95
A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".
The margin of error is the range of values below and above the sample statistic in a confidence interval.
Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".
2) Calculate the mean (Point of estimate for [tex]\mu[/tex]) and standard deviation for the sample
On this case we need to find the sample standard deviation with the following formula:
[tex]s=\sqrt{\frac{\sum_{i=1}^15 (x_i -\bar x)^2}{n-1}}[/tex]
And in order to find the sample mean we just need to use this formula:
[tex]\bar x =\frac{\sum_{i=1}^{15} x_i}{n}[/tex]
The sample mean obtained on this case is [tex]\bar x= 56.8[/tex] and the deviation s=2.052. Since we know the population standard deviation [tex]\sigma^2=6[/tex] and [tex]\sigma=2.449[/tex]
3) Calculate the critical value tc
In order to find the critical value is important to mention that we don't know about the population standard deviation, so on this case we need to use the t distribution. Since our interval is at 95% of confidence, our significance level would be given by [tex]\alpha=1-0.95=0.05[/tex] and [tex]\alpha/2 =0.025[/tex].
We can find the critical values in excel using the following formulas:
"=NORM.INV(0.025,0,1)" for [tex]t_{\alpha/2}=-1.96[/tex]
"=NORM.INV(1-0.025,0,1)" for [tex]t_{1-\alpha/2}=1.96[/tex]
The critical value [tex]zc=\pm 1.96[/tex]
3) Calculate the margin of error (m)
The margin of error for the sample mean is given by this formula:
[tex]m=z_c \frac{\sigma}{\sqrt{n}}[/tex]
[tex]m=1.96 \frac{2.449}{\sqrt{10}}=1.518[/tex]
4) Calculate the confidence interval
The interval for the mean is given by this formula:
[tex]\bar X \pm z_{c} \frac{\sigma}{\sqrt{n}}[/tex]
And calculating the limits we got:
[tex]56.8 - 1.96 \frac{2.449}{\sqrt{10}}=55.282[/tex]
[tex]56.8 + 1.96 \frac{2.449}{\sqrt{10}}=58.318[/tex]
The 95% confidence interval is given by (55.282;58.318)
On the basis of these very limited data, what is the probability that an individual snack pack selected at random is filled with less than 52 grams of candy?
On this case we can use as point of estimate for the mean the result from part a, [tex]\bar x= 56.8[/tex] and the variance is [tex]\sigma^2 =6[/tex], so [tex]\sigma =\sqrt{6}[/tex]. And we are interested on this probability:
[tex]P(X<52) = P(Z<\frac{52-56.8}{\sqrt{6}})=P(Z<-1.96) = 0.025[/tex]
You bike 9.8 miles in 1.4 hours at a steady rate.What equation represents the proportional relationship between the x hours you bike and the distance in miles that you travel
Answer:
The equation is [tex]\frac{x}{y}= 8[/tex]
Step-by-step explanation:
Let the time for which i bike is = x hours
Let the distance traveled in x hours = y miles
Ratio of distance and time will be = x : y
I travel 11.2 miles in 1.4 hours then the ratio of time and the distance traveled will be 1.4 : 11.2 Or 14 : 112
then the ratio of distance and time will be same in both the cases
So equation will be
[tex]\frac{x}{y} =\frac{14}{112}\\\\\frac{x}{y} =8[/tex]
Hence, equation representing the proportional relationship will be [tex]\frac{x}{y}= 8[/tex]
the circular ripple caused by dropping a stone in a pond is increasing in area at a constant rate of 20 square meters per second. Determine how fast the radius of this circular ripple is increasing when the area of the circular region is 25 pi
Answer:
2/π ≈ 0.637 m/s
Step-by-step explanation:
The rate of change of area with respect to time is ...
A = πr²
dA/dt = 2πr·dr/dt
Filling in given values in the above equations, we can find r and dr/dt.
25π = πr² ⇒ r = 5
20 = 2π·5·dr/dt
dr/dt = 20/(10π) = 2/π . . . . meters per second
The radius is increasing at the rate of 2/π ≈ 0.637 meters per second.
Sally has just finished her thirty-fifth year with her company and is getting ready to retire. During her thirty-five years, Sallys average annual salary was 45,603 How much can Sally expect to receive from Social Security annually if she were to retire today?
a. $191.53
b. $1,915.33
c. $19,153.26
d. $191,532.60
Answer:
$19153.26
Step-by-step explanation:
Here is the complete question: Sally has just finished her thirty-fifth year with her company and is getting ready to retire. During her thirty-five years, Sallys average annual salary was 45,603 How much can Sally expect to receive from Social Security annually if she were to retire today? (Assume she will receive 42% of her average annual salary.)
Given: Sally´s average salary while working is $45603.
Sally will receive 42% of her average annual salary as social security.
Now, finding annual income of sally after retirement.
Sally´s income from social security after retirement= [tex]\frac{42}{100} \times 45603= \$ 19153.26[/tex]
∴ Sally receive $ 19153.26 annually from social security.
Priya starts with $50 in her bank account. She then deposits $20 each week for 12 weeks. Write an equation that represents the relationship between the dollar amount in her bank account and the number of weeks of saving
The equation d=50+20w represents the relationship between dollar amount in her bank account and the number of weeks of savings.
Step-by-step explanation:
Amount in bank account = $50
Amount deposited by Priya = $20
Time period = 12
Let,
d be the dollar and w be the weeks
Therefore, we will multiply the number of week,w, with 20 to find total savings and add the amount that she has initially in her account.
Therefore,
[tex]d=50+20w[/tex]
The equation d=50+20w represents the relationship between dollar amount in her bank account and the number of weeks of savings.
Keywords: linear equation, addition
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The equation that represents Priya's savings over time is y = 50 + 20x. In this equation, y is the total amount in the bank account and x is the number of weeks.
Explanation:The relationship described in the problem can be represented by a linear equation. Here, the initial $50 in Priya's bank account is the starting value (or y-intercept). The $20 she deposits each week represents the constant rate of change (or slope), and the number of weeks is the variable.
Therefore, the relationship can be represented by the equation y = 50 + 20x, where y represents the total dollar amount in the bank account and x is the number of weeks Priya has been saving.
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Abscissa is:
a. the first number (or x value) of an ordered pair coordinate plane
b. a way of locating points in a plane that consists of a horizontal and a vertical number line intersecting at the zeros coordinates
c. an ordered pair, (x, y), that describes the location of a point in the coordinate plane ordinate
d. the second number (or y-value) of an ordered pair origin
e. the point of intersection, (0, 0), of the axes in the coordinate plane quadrant
f. region in the coordinate plane x-axis
g. the horizontal axis in the coordinate plane y-axis
h. the vertical axis in the coordinate plane
Answer:
The first number (or x value) of an ordered pair.
Step-by-step explanation:
Abscissa is the first number (or x value) of an ordered pair.
A coordinate plane is a way of locating points in a plane that consists of a horizontal and a vertical number line intersecting at the zeros.
Coordinates are an ordered pair, (x, y), that describes the location of a point in the coordinate plane.
Ordinate is the second number (or y value) of an ordered pair.
Origin is the point of intersection, (0, 0), of the axes in the coordinate plane.
A quadrant is a region in the coordinate plane.
X axis is the horizontal axis in the coordinate plane.
Y axis is the vertical axis in the coordinate plane.
Line A is the
✔ y-axis .
Region B is
✔ a quadrant .
Point C is the
✔ origin .
Line D is the
✔ x-axis .
hope this helps :)
An art student is trying to determine how many tubes of paint they will need for their mural. If they are using 3 tubes every 4 days, how many tubes would they use in 8 days?
Answer: 6 tubes
Step-by-step explanation:
Create a simple relationship.
4 days = 3 tubes
8 days = ? tubes
Well, if there is twice as many days, twice as many tubes will be used.
4 days x 2 = 8 days
3 tubes x 2 = 6 tubes
Going against the current, a boat takes 6 hours to make a 120-mile trip. When the boat travels with the current on the return trip, it takes 5 hours. If x = the rate of the boat in still water and y = the rate of the current, which of the following systems could be used to solve the problem? A) 6(x - y) = 120 B) 5(x + y) = 120 C) 6(x + y) = 120 D) 5(x - y) = 120 E) 6x - 5y = 120 F) x + y = 120
Answer:
You can use A and B systems
Step-by-step explanation:
Lets call z the total speed of the boat. If the boat goes against the current, then, the current will drop the boat natural speed, and therefore z is obtained from substracting y from the rate of the boat on still water, x. Thus, z = x-y. If The boat goes in favor of the current, then the current will raise the speed, and we obtain z by adding y to x. If we want to calculate x and y, we know that:
On the first trip, z = x-y, and it took 6 hours to finish the 120 mile trip, therefore 6z = 120, or equivalently, 6(x-y)=120
On the return trip, z = x+y, and it took 5 hours to finish the trip, so we have 5z = 5(x+y) = 120.
Thus, in order so solve the problem, we can use system A and B.
Note that system A is equivalent to the equation x-y = 20, obtained by dididing everything by 6. If we divide by 5 the second equation we obtain that x+y = 24. We have
x-y = 20x+y = 24By summing this equations it follows that 2x = 44, therefore x = 22. Since x-y = 20, we obtain that y = 2.
Answer:
The correct answer is 6(x - y) = 120 and 5(x + y) = 120
Nina earns $60 for 5 hours of shoveling snow. Complete each statement if Nina keeps earning her money at this same rate.
Answer:
she keeps her earnings the same
The total operating total cost of the truck is $400000 per year the percentage break down $40% fixed cost $30 fuel $20 fianiance $10 maintance Increace 1.5 to 1.6
Answer:
$8,000.00 /yr
Step-by-step explanation:
The original fuel cost was 30% of 400,000 or $120,000.
If the previous cost was 1.50/L, then 120,000/1.5 = 80,000L/yr
The extra $0.10/L thus adds .1(80,000) = $8,000.00 /yr
Naturally occurring gallium is a mixture of isotopes that contains 60.11% of Ga-69 (atomic mass = 68.93 u) and 39.89% of Ga-71 (atomic mass = 70.92 u). Which numerical setup can be used to determine the atomic mass of naturally occurring gallium?
To determine the atomic mass of naturally occurring gallium, convert the percentages of each isotope to decimals, multiply each decimal by its atomic mass, and add the products. The average atomic mass of gallium is 69.72 u.
Explanation:The atomic mass of naturally occurring gallium can be determined using the following numerical setup:
Convert the percentages of the isotopes (60.11% and 39.89%) to decimals (0.6011 and 0.3989).
Multiply the decimal for each isotope by its atomic mass.
Add the products from step 2 to get the average atomic mass.
Round the final result to the appropriate number of significant figures.
In this case, the numerical setup would be:
(0.6011 x 68.93 u) + (0.3989 x 70.92 u) = 69.72 u
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Final answer:
To find the atomic mass of naturally occurring gallium, you perform a weighted average, multiplying the abundance of each isotope by its atomic mass, then summing the results. Using the given abundances and atomic masses, the atomic mass of gallium is approximately 69.75 u.
Explanation:
To calculate the atomic mass of naturally occurring gallium, which is a mixture of isotopes, you would set up a weighted average based on the isotopic composition and the atomic masses of the individual isotopes. You have Ga-69 with an atomic mass of 68.93 u, comprising 60.11% of gallium, and Ga-71 with an atomic mass of 70.92 u, making up 39.89% of gallium.
The numerical setup is as follows:
Atomic mass of gallium = (% abundance of Ga-69 × atomic mass of Ga-69) + (% abundance of Ga-71 × atomic mass of Ga-71)
Converting the percentage to a decimal fraction (60.11% = 0.6011 and 39.89% = 0.3989), the equation becomes:
Atomic mass of gallium = (0.6011 × 68.93 u) + (0.3989 × 70.92 u)
We then perform the multiplication and add the results:
Atomic mass of gallium = (0.6011 × 68.93 u) + (0.3989 × 70.92 u) = 41.433863 u + 28.320708 u = 69.754571 u
Thus, the atomic mass of naturally occurring gallium can be approximated to 69.75 u.
Students were surveyed about their favorite colors 1/4 of the students preferred read 1/8 of the students preferred blue and 3/5 of the remaining students were for green if 15 students prefer green how many students were surveyed
Answer: the number of students that were surveyed is 40
Step-by-step explanation:
Let x = total number of students that were surveyed about their favorite colors
1/4 of the students preferred red.
This means that the number of students that preferred red is 1/4 × x = x/4
1/8 of the students preferred blue.
This means that the number of students that preferred blue is 1/8 × x = x/8
The remaining number of students will be the total number of students - the sum of the number of students that preferred red and the number of students that preferred blue. It becomes
x - (x/4 + x/8) = x - 3x/8 = 5x/8
3/5 of the remaining students were for green. This means that the number of students that preferred green is 3/5 × 5x/8 = 3x/8
if 15 students prefer green, then
3x/8 = 15
3x = 120
x = 120/3 = 40 students
Simplify.
7/8+(−2/3) divided by 5/6
Enter your answer, in simplest form, in the boxes.
Answer:
your answer is 1/4
Step-by-step explanation:
part 1
7/8 + -2/3 = 5/24
part 2
5/24÷5/6 = 1/4
A ladder 10 ft long leans against a vertical wall. If the bottom of the ladder slides away from the base of the wall at a speed of 2 ft/s, how fast is the angle between the ladder and the wall changing when the bottom of the ladder is 6 ft from the base of the wall?
Answer:
[tex]\frac{dx}{dt}=\frac{-8}{3}\frac{ft}{s}[/tex]
Step-by-step explanation:
Be [tex]\frac{dy}{dt}=2\frac{ft}{s}[/tex] to find [tex]\frac{dx}{dt}=?, x=6ft[/tex]
[tex]x^{2} +y^{2}=10^{2};6^{2}+y^{2}=100;y^{2}=100-36=64;y=\sqrt{64}=+-8[/tex]→ y=8 for being the positive distance, deriving from t, [tex]x^{2} +y^{2}=100[/tex]→[tex]2x\frac{dx}{dt}+2y\frac{dy}{dt}=0[/tex]→[tex]2x\frac{dx}{dt}=-2y\frac{dy}{dt};\frac{dx}{dt}=-\frac{2y}{2x}\frac{dy}{dt}; \frac{dx}{dt}=-\frac{y}{x}\frac{dy}{dt}[/tex], if x=6 and y=8
[tex]\frac{dx}{dt}=\frac{-8}{6}2[/tex]→[tex]\frac{dx}{dt}=\frac{-8}{3}\frac{ft}{s}[/tex]
we must find the rate of change in radians over seconds, being the speed 8/3 ft / s = 2.66 ft / s the variation in degrees is determined when traveling 6 ft
For every 2 nickels there are 3 dimes. For every 2 dimes there are 5 quarters. There are 500 coins in total. How many nickels, dimes, and quarters are in the piggy bank? Explain your reasoning.
Answer:
80 nickels120 dimes300 quartersStep-by-step explanation:
The ratio of nickels to dimes is 2 : 3 = 4 : 6.
The ratio of dimes to quarters is 2 : 5 = 6 : 15.
Then the ratios of nickels : dimes : quarters are ...
4 : 6 : 15
There are a total of 4+6+15 = 25 ratio units representing 500 coins, so each one represents 500/25 = 20 coins. Then the numbers of coins are ...
nickels : dimes : quarters = 4·20 : 6·20 : 15·20 = 80 : 120 : 300
There are 80 nickels, 120 dimes, and 300 quarters in the piggy bank.
To determine the number of nickels, dimes, and quarters in the piggy bank, set up equations based on the given relationships and the total number of coins. Solve the system of equations to find the values of 'n', 'd', and 'q'.
Explanation:Let's start by assigning variables to the number of nickels, dimes, and quarters. Let's say there are 'n' nickels, 'd' dimes, and 'q' quarters. From the given information, we know that for every 2 nickels, there are 3 dimes, and for every 2 dimes, there are 5 quarters.
Therefore, we can set up the following equations:
2n = 3d
2d = 5q
Additionally, we know that there are a total of 500 coins, so we can write 'n + d + q = 500'.
Using these equations, we can solve for the values of 'n', 'd', and 'q'.
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In a recent survey of drinking laws, a random sample of 1000 women showed that 65% were in favor of increasing the legal drinking age. In a random sample of 1000 men, 60% favored increasing the legal drinking age. Test the hypothesis that the percentage of men and women favoring a higher legal drinking age is the same. Use α = 0.05.
Answer:
The percentage of men and women favoring a higher legal drinking age is the same
Step-by-step explanation:
A random sample of 1000 women showed that 65% were in favor of increasing the legal drinking age
n = 1000
No. of females were in favor of increasing the legal drinking age = [tex]\frac{65}{100} \times 1000=650[/tex]
y=650
In a random sample of 1000 men, 60% favored increasing the legal drinking age
n = 1000
No. of males were in favor of increasing the legal drinking age = [tex]\frac{60}{100} \times 1000=600[/tex]
y=600
[tex]n_1=1000 , y_1=650\\n_2=1000 , y_2=600[/tex]
We will use Comparing Two Proportions
[tex]\widehat{p_1}=\frac{y_1}{n_1}[/tex]
[tex]\widehat{p_1}=\frac{650}{1000}[/tex]
[tex]\widehat{p_1}=0.65[/tex]
[tex]\widehat{p_2}=\frac{y_2}{n_2}[/tex]
[tex]\widehat{p_2}=\frac{600}{1000}[/tex]
[tex]\widehat{p_2}=0.6[/tex]
Let p_1 and p_2 be the probabilities of men and women favoring a higher legal drinking age is the same.
So, [tex]H_0:p_1=p_2\\H_a:p_1 \neq p_2[/tex]
[tex]\widehat{p}=\frac{y_1+y_2}{n_1+n_2} =\frac{600+650}{1000+1000}=0.625[/tex]
Formula of test statistic :[tex]\frac{\widehat{p_1}-\widehat{p_2}}{\sqrt{\widehat{p}(1-\widehat{p})(\frac{1}{n_1}+\frac{1}{n_2})}}[/tex]
test statistic : [tex]\frac{0.65-0.6}{\sqrt{0.625(1-0.625)(\frac{1}{1000}+\frac{1}{1000})}}[/tex]
test statistic : 2.3094
Refer the z table for p value :
p value : 0.9893
α = 0.05.
p value > α
So, we failed to reject null hypothesis .
So, the percentage of men and women favoring a higher legal drinking age is the same
The p-value for a two-sided test of the null hypothesis H0: μ = 10 is 0.06.(a) Would a 95% confidence interval for μ include the value 10? Why?(b) Would a 90% confidence interval for μ include the value 10? Why?
Answer:
a) Yes b) No
Step-by-step explanation:
Given that the p value for a two-sided test of the null hypothesis H0: μ = 10
is 0.06
a) [tex]p value = 0.06.\\Confidence level = 95%\\Significance level = 100-95 = 5%\\Alpha = 0.05\\\\p \geq \alpha is true[/tex]
Hence we accept null hypothesis
This implies that 10 will be within the confidence interval of 95%
b) If confidence level = 90%
[tex]\alpha = 0.10\\p value = 0.06\\p \leq 0.10[/tex]
So we have to reject null hypothesis.
So we do not have 10 in the confidence interval
The reason is the lower the confidence level, the narrower the confidence interval. In this case, 10 has gone outside the narrower interval hence we get this.
Brian found 12-19 by breaking apart 19 into 12+7 write equations to show how Brian could have found the difference. ?
Answer:
Answer is 12-19 = -7
Step-by-step explanation:
12- 19 you can break 19 into 12 +7
then
it is easy to find 12-12 = 0
Now subtracts 0 - 7 =- 7
then
break 7 into 3 + 4
then
0 - 3 = -3
-3 - 4 = -7
So ,
12 - 19 = -7
find the length and width of a rectangle whose perimeter is 26 feet and whose area is 42 square feet
Answer: length = 7 feet's
Width = 6 feets
Step-by-step explanation:
Perimeter of a rectangle is the distance round the rectangle.
Perimeter of rectangle is expressed as
2(length + width)
The perimeter of the given rectangle is 26 feet. Therefore
2(L + W) = 26
Dividing by 2,
L+W = 13
The area of a rectangle is expressed as length × width
The given area is 42 square feet. Therefore,
L×W = 42
Substituting L = 13 - W into LW = 42, it becomes
W(13-W) = 42
13W - W^2 = 42
W^2 -13W + 42 = 0
W^2 -7W - 6W + 42 = 0
W(W - 7) - 6(W - 7) = 0
(W-6)(w-7)=0
W-6 = 0 or W-7=0
W=6 or W = 7
L= 13-6 or L= 13-7
L= 7 or L = 6
Final answer:
Using the formulas for the perimeter and the area of a rectangle, we set up two equations, solved them simultaneously, factored a quadratic equation, and found that the dimensions of the rectangle are 7 feet in length and 6 feet in width.
Explanation:
To find the dimensions of a rectangle given the perimeter and the area, we can set up two equations based on these two pieces of information. The perimeter (P) of a rectangle is given by the formula P = 2l + 2w, where l is the length and w is the width. The area (A) of a rectangle is given by the formula A = lw. For the problem given, we have:
P = 26 feetA = 42 square feetLet's denote the length as l and the width as w. We can now write:
2l + 2w = 26lw = 42Solving these two equations simultaneously will give us the length and width of the rectangle. Firstly, we can rearrange the perimeter equation to express one variable in terms of the other:
l = (26 - 2w) / 2
Substitute this expression for l into the area equation:
((26 - 2w) / 2)w = 42
Multiplying both sides of the equation by 2 to clear the fraction:
(26 - 2w)w = 84
Distribute w across:
26w - 2w² = 84
Rearrange the quadratic equation:
2w² - 26w + 84 = 0
Divide by 2 to simplify:
w² - 13w + 42 = 0
Factor the quadratic equation:
(w - 6)(w - 7) = 0
Therefore, w could be either 6 or 7. Since the width must be less than the length for a rectangle (based on the problem context where length is typically the longer dimension), we can deduce that:
Width (w) = 6 feet
Then substitute the width into the perimeter equation to find the length:
2l + 2(6) = 26
2l + 12 = 26
2l = 14
l = 14 / 2
Length (l) = 7 feet
Hence, the dimensions of the rectangle are 7 feet by 6 feet.
You have a gift card for a coffee shop worth $90. Each day you use the card to get a coffee for $4.10. Write an explicit formula to represent the amount of money available as an arithmetic sequence. What is the value of the card after you buy your 8th coffee?
Answer: The value of the card after you buy your 8th coffee will be $61.3
Step-by-step explanation:
The worth of the gift card for the coffee shop is $90. Each day you use the card to get a coffee for $4.10. This means that the worth of the gift card is reducing by $4.10 each day. This rate is in arithmetic progression.
The formula for the nth term of an arithmetic sequence, Tn is expressed as
Tn = a + (n-1)d
Where a is the first term
d is the common difference
n is the number of days
From the information given,
a = $90
d = - $4.1
The explicit formula representing the amount of money available will be
Tn = 90 - 4.1(n - 1)
The value of the card after you buy your 8th coffee will be
T8 = 90 - 4.1(8 - 1) = T8 = 90 - 4.1×7
T8 = 90 - 28.7
T8 = $61.3
determine the intervals on which the function is increasing, decreasing, and constant
Answer:
increasing: (-1, ∞)decreasing: (-∞, -1)constant: nowhereStep-by-step explanation:
A function is increasing when it is rising to the right. Here, that is everywhere right of x=-1.
A function is decreasing when it is falling to the right. Here, that is everywhere left of x=-1.
A function is constant when its graph is horizontal. There are no places on this graph like that.
The brand name of a certain chain of coffee shops has a 54% recognition rate in the town of Coffleton. An executive from the company wants to verify the recognition rate as the company is interested in opening a coffee shop in the town. He selects a random sample of 10 Coffleton residents. Find the probability that exactly 7 of the 10 Coffleton residents recognize the brand name.
0.0824
0.156
0.000806
0.0850
Answer:
0.156
Step-by-step explanation:
Using binomial probability formula, we have :
P( a out of n ) =ⁿCₐ x pᵃ x qⁿ⁻ᵃ ------------------------------------------------- (1)
Where n = total number of sample
a = number of success
p = probability of success
q = probability of failure
n-a = number of failures
From the question:
n =10 , a = 7, p=0.54, q = 1-p = 0.46
Substituting into equation (1) we have:
P (7 out of 10) = ¹⁰C₇ x (0.54)⁷x (0.46)¹⁰⁻⁷
= 0.1563
≈ 0.156
Which of the following best describes artificial intelligence? a. To build systems that can mimic human intelligence b. Viewing the physical world with computer-generated layers of information c. A computer simulated environment d. A knowledge-based information system that accomplishes specific tasks on behalf of its users
Answer:
a. To build systems that can mimic human intelligence.
Step-by-step explanation:
Artificial intelligence or machine intelligence is a part of computer development where computer systems are made to be able to perform tasks that usually require human intelligence like - speech recognition, language translation etc.
Artificial intelligence seeks to build a system that can mimic human intelligence.
Hence, the correct answer is option A.
Artificial intelligence seeks to build systems that can mimic human intelligence. Then the correct option is A.
What is artificial intelligence?The ability of an electronic machine that can perform tasks commonly associated with intelligent beings.
Artificial intelligence is a part of computer development where computer systems are made to be able to perform tasks that usually require human intelligence like speech recognition, language translation, etc.
Since all the condition that is fulfilled by option A.
Thus, the correct option is A.
More about the Artificial intelligence link is given below.
https://brainly.com/question/25757825
Rachel runs 2km to her bus stop, and then rides 4.5 km to school. On average, the bus is 45 km/h faster than Rachel's average running speed. If the entire trip takes 25 minutes, how fast does Rachel run?
Answer:6.042km/h 6km/h approximately
Step-by-step explanation:
First off we have to know the formula relating speed, distance and time which is
Speed = distance/time
Now we are looking for Rachel's running speed
We are to find Rachel's running speed, so let's label is x
We are given that the distance Rachel runs to her bus stop is 2km
We were not given the time she uses to run to the bus stop
So let's label the time Rachel uses to run to her bus stop as y
So from the formula speed = distance/time
We have x = 2/y
Now we are told that the speed the bus uses to get to school is 45km/h faster than her speed used to run
So speed of bus = 45 + x
And the overall time for the whole journey is 25mins, changing this to hours, because the speed details given is in km/h we divide 25 by 60 which will give 0.417
Now if the total time is 0.417 hours, and we labeled the time for Rachel to run to the bus as y, so the time for the time for the bus to get to school will be 0.417 - y
We are also told the bus rides for 4.5km to school
So adding this together to relate the speed, distance and time of the bus with the formula speed = distance/time
We get 45 + x = 4.5/(0.417 - y)
So we have two equations
x = 2/y (1)
45+x = 4.5/(0.417-y) (2)
So putting (1) in (2) we have
45 + (2/y) = 4.5/(0.417-y)
Expanding further
(45y + 2)/y = 4.5(0.417-y)
Cross multiplying
(45y + 2)(0.417 - y) = 4.5y
Opening the brackets
18.765y - 45y2 + 0.834 - 2y = 4.5y
Collecting like terms
-45y2 + 18.765y -2y - 4.5y + 0.834 = 0
-45y2 + 12.265 + 0.834 = 0
Dividing all sides by -45 to make the coefficient of y2 1
y2 - 0.273y - 0.019 = 0
Now we have gotten a quadratic equation, and since it's with decimal numbers we can use either completing the square method of almighty formula
I'm using almighty formula her
For solving
ax2 + bx + c = 0
x = (-b +-root(b2-4ac)/2a
For our own equation, we are finding y
From our our quadratic equation
a = 1, b=-0.273, c = -0.834
you = (-(-0.273)+-root(-0.273-4(1)(-0.019))/2(1)
y = (273+-root(0.151))/2
y = (0.273+0.389)/2 or (0.273-0.389)/2
y = 0.331 or -0.085
So we use the positive answer which is 0.331, because time can't be negative
Then we put y = 0.331 in (1)
x = 2/y
x = 2/0.331
x = 6.042km/h
x = 6km/h approximately
Rachel's running speed was calculated by forming equations based on the given scenario of her running and riding the bus, solving these equations simultaneously provides the answer.
Explanation:This problem is a classic case of the combined speed-time-distance problem. It involves two segments: Rachel running and then riding the bus. The time taken for these two segments combined is given as 25 minutes. We can denote Rachel's running speed as 'r' and her running time as 't1', and the bus speed as 'r+45' and bus time as 't2'.
From the question, we can formulate the following two equations:
Distance = Speed X Time, thus: 2 = r x t1 And, 4.5 = (r+45) x t2The total time 't1 + t2' is equal to 25/60 hours (converting to the same unit).
Now, we solve these equations together to find the value of 'r', Rachel's running speed.
This shows the importance and application of average speed, time and distance in real-world situations.
Learn more about Speed-Time-Distance problem here:
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1.) What are the zeros of the polynomial? f(x)=x^4-x^3-16x^2+4x+48.
2.) How many complex zeros does the function f(x)=x^4+3x^3+5x^2-3x-6?
3.) Factor the polynomial function. f(x)=x^4+2x^3-6x^2+4x-16.
Thanks for whoever answers
The zeros of a polynomial are the solutions to the polynomial equation. The function [tex]x^4+3x^3+5x^2-3x-6[/tex] has exactly 4 zeros due to the Fundamental Theorem of Algebra. The polynomial [tex]f(x)=x^4+2x^3-6x^2+4x-16[/tex]can be factored by grouping.
Explanation:1.) The zeros of the polynomial [tex]f(x)=x^4-x^3-16x^2+4x+48[/tex] are the solutions to the equation [tex]x^4-x^3-16x^2+4x+48=0[/tex]. Unfortunately, this equation does not have simple solutions and would require numerical techniques to solve.
2.) The function [tex]f(x)=x^4+3x^3+5x^2-3x-6[/tex] is a fourth degree polynomial, implying that it has exactly 4 zeros in the complex number system. This is a consequence of the Fundamental Theorem of Algebra, which states that every non-zero, single-variable, degree n polynomial with complex coefficients has exactly n roots in Complex Numbers.
3.) The polynomial [tex]f(x)=x^4+2x^3-6x^2+4x-16[/tex] can be factored by grouping as follows [tex]: f(x)=x^4+2x^3-6x^2+4x-16=(x^4+2x^3)-(6x^2-4x+16) = x^3(x+2)-2(x^3-2x+8)=x^3(x+2)-2(x-2)^2.[/tex]
Learn more about Polynomials here:https://brainly.com/question/20121808
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