Answer: the correct option is A
Step-by-step explanation:
We want to find 95% confidence interval for the mean of the weight of pretzels.
Number of samples. n = 15 bags
Mean, u = 10.2
Standard deviation, s = 0.25
We will use the t- test
Degree of freedom = n - 1 = 15 - 1= 14
Alpha, a = (1-confidence interval )/2
a = (1-0.95)/2 = 0.025
Looking at the t-distribution table, the corresponding z value is 2.131
Confidence interval = z × standard deviation/√n
Confidence interval = 2.131 × 0.25/√15
Confidence interval = 0.13755545851
Approximately 0.138
At 95% confidence interval,
The lower end is 10.2 - 0.138 = 10.062 Approximately 10.06
The upper end is 10.2 - 0.138 = 10.338. Approximately 10.34
You purchase a home for $253,600.00 with a mortgage rate of 3.75% APR. How much
interest is due after your first month?
(1 point)
$79.25
$660.42
$792.50
$951.00
Answer:
$792.50
Step-by-step explanation:
As the mortgage rate is 3.75% APR , One has to pay 3.75% of the amount of home in a year as Interest .
Amount of home = $253,600.00
One year interest one has to pay in a year = [tex]\frac{3.75}{100}[/tex]×253,600
= $9510.
So, In one month , he has to pay amount $[tex]\frac{9510}{12}[/tex] .
= $792.5.
In one month you earn $16 for mowing the lawn $15 for babysitting and $20 for allowance you spend$12 at the movie theater how much more money do you need to buy a $45 video game
Answer:
$6
Step-by-step explanation:
so you add 16 15 and 20 to see how much you earned in total, to get 51 dollars. we subtract 12 because we used it at the movies and get 39 dollars in total. now we subtract this from 45 to see how much more we need to get 6.
equation: 45-(15+16+20-12)........this equals 6 as well
You need to earn more money to buy a $45 video game and it is equal to $6.
What is algebra ?
Algebra is a branch of mathematics that deals with various symbols and the arithmetic operations such as addition , subtraction , etc.
It is given that , you earn some money by doing different works. The earn money from different works is given.
By mowing the lawn money earned = $16
For babysitting money earned = $15
Money earned for the allowance = $20
So , the total money earned is :
= $16 + $15 + $20
= $51
Now , you have spend $12 at the movie theatre. That meant the money now left is :
= $51 - $12
= $39
You need to buy a video game which costs $45. So , you need to earn some more money which is :
= $45 - $39
= $6
Therefore , you need to earn more money to buy a $45 video game and it is equal to $6.
Learn more about algebra here :
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Find the missing side length
Answer:
Step-by-step explanation:
The triangle given is aright angle triangle. This is because one if its angles is 90 degrees. The other two angles add up to give 180 degrees. Looking at the right angle triangle, taking the 8 degree angle as the reference angle, the length of the adjacent side is 82, the length of the opposite side is t. Applying trigonometric ratio,
Tan # = opposite side / adjacent side.
# = 8 degrees
Tan 8 = t/82
t = 82 tan8
t = 82 × 0.1405
t = 11.521
Write down the quadratic equation whose roots are x = -7 and x = 1, and the coefficient of $x^2$ is 1. Enter your answer in the form "x^2 + bx + c = 0".
For this case we must write a quadratic equation of the form:
[tex]x ^ 2 + bx + c = 0[/tex]
We have two roots:
[tex]x_ {1} = - 7\\x_ {2} = 1[/tex]
Thus, we can rewrite the equation in a factored form as:
[tex](x + 7) (x-1) = 0[/tex]
If we apply distributive property we have:
[tex]x ^ 2-x + 7x-7 = 0[/tex]
Different signs are subtracted and the major sign is placed.
[tex]x ^ 2 + 6x-7 = 0[/tex]
Answer:
The quadratic equation is:
[tex]x ^ 2 + 6x-7 = 0[/tex]
A research firm conducted a survey to determine the mean amount Americans spend on coffee during a week. They found the distribution of weekly spending followed the normal distribution with a population standard deviation of $5. A sample of 64 Americans revealed that X¯¯¯=$20 . What is the 95% confidence interval estimate of μ?
Answer:
95% confidence Interval would be between $18.775 and $20.225.
Step-by-step explanation:
Confidence Interval can be calculated using M±ME where
M is the sample mean Americans spend on coffee during week. ($20)ME is the margin of error from the meanAnd margin of error (ME) around the mean calculated as
ME=[tex]\frac{z*s}{\sqrt{N} }[/tex] where
z is the corresponding statistic in 95% confidence level (1.96)s is the population standard deviation ($5)N is the sample size (64)Using the numbers, we get:
ME=[tex]\frac{1.96*5}{\sqrt{64} }[/tex] =1.225
Then 95% confidence Interval would be 20±1.225 or between $18.775 and $20.225
Answer:
The confidence interval is between 18.775 and 21.225.
Step-by-step explanation:
A company with a fleet of 150 cars found that the emissions systems of only 5 out of the 22 they tested failed to meet pollution control guidelines. The 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? Your Question: State the null hypothesis and the alternative hypotheses they should use for completing a hypothesis test.
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%.
A line contains the points (a, b) and (a + 3, b + 3). Find the equation of the line in terms of a and b in point-slope form, and then convert it to slope-intercept form.
Answer:
y -b = x -ay = x + (b-a)Step-by-step explanation:
The slope is the ratio of the change in y to the change in x:
m = ((b+3) -b)/((a +3) -a) = 3/3 = 1
The point-slope form of the equation of a line through point (h, k) with slope m is ...
y -k = m(x -h)
Here, we have (h, k) = (a, b) and m=1, so the equation in point-slope form is ...
y -b = x -a
Adding b puts this in slope-intercept form:
y = x + (b-a)
Mr .Cruz is the director of an after school program. He says that 170 or 85%of the students went on to attend collage. A parent wants to know the total number of students in the program
Answer:
200 students were in the program
Step-by-step explanation:
The parent should know how to figure ...
170/85% = total/100%
This is the same as ...
total = 170/0.85 = 200
200 students were in the program.
_____
Critical Thinking
There are three declarative statements here. There is no question. We have made up a question to answer.
Another possible answer to the non-question could be, "The parent can ask his student how many students were in the program."
Answer:
Step-by-step explanation:
20
cause i said so
Marathon runner covered the whole distance in 4 hours running at a constant speed of 8.1 km per hour. How long would it take him to cover the same distance if he decreased the speed to 7.2 km per hour?
Answer: it will take him 4.5 hours to cover same distance
Step-by-step explanation:
Marathon runner covered the whole distance in 4 hours running at a constant speed of 8.1 km per hour.
Speed = distance / time
Distance = speed×time
Therefore, distance covered by the marathon runner in in 4 hours, running at a speed of 8.1 km per hour is
8.1 × 4 = 32.4 kilometers
if he decreased the speed to 7.2 km per hour, the distance remains 32.4 kilometers. Therefore,
At 7.2 km per hour, the time it would take him to cover the same distance would be
Distance/ speed = 32.4/7.2 = 4.5 hours
Please help me out with this
Answer:
A) 4x - 2y + 3z = - 3
B) 2x - 3y + 2z = 1
C) 6x + 10z = -2
Multiply A) by -1.5
A) -6x +3y -4.5z = 4.5 Then adding to B)
B) 2x - 3y + 2z = 1
D) -4x -2.5z = 5.5 then we add this to C)
C) 6x + 10z = -2 Now we multiply D) by 1.5
D) -6x -3.75z = 8.25 Adding C) + D)
6.25z = 6.25
z = 1 Then putting z = 1 into A) and B)
A) 4x - 2y + 3 = - 3 equals A) 4x -2y = -6
B) 2x - 3y + 2 = 1 equals B) 2x -3y = -1 we divide A) by -2
A) -2x + y = 3 then adding to B
B) 2x - 3y = -1
-2y = 2
y = -1
FINALLY solving for x we'll use equation A)
A) 4x - 2*-1 + 3*1 = - 3
A) 4x +2 + 3 = -3
A) 4x = -8
x = -2
(Yes, it's just that easy. LOL)
Step-by-step explanation:
1.a.) Find the next four terms: a8,a9,a10,a11
[tex]a_{n}[/tex]=0, 9, -26, 65, -124, 217, -342
1.b) Find a direct formula for [tex]a_{n}[/tex], [Hint: You may want to look at perfect squares, perfect cubes, powers of 2, powers of 3...]
Answers:
1a) The next four terms are: 513, -728, 1001, -1330
1b) The direct formula is [tex]a_n = (-1)^n*n^3+1[/tex]
================================================
Explanation:
It helps to start with part B first. The direct formula will help us find the next four terms in a very efficient manner.
Start with the sequence {0, 9, -26, 65, -124, 217, -342}
Subtract 1 from each term to get this new sequence {-1, 8, -27, 64, -125, 216, -343}, which closely resembles the sequence {1, 8, 27, 64, 125, 216, 343}. This is the sequence of perfect cubes. The only difference is that each term alternates from positive to negative and vice versa.
So we will have an n^3 as part of the equation and also a (-1)^n as part of the equation. The (-1)^n portion allows us to alternate in signs. Put together we have (-1)^n*n^3 so far
The last thing we do is add 1 to this so that we undo the operation "subtract 1" we did earlier to the original list.
Therefore the formula is [tex]a_n = (-1)^n*n^3+1[/tex]
--------------------
To help verify we have the right formula, plug in n = 1 and we get
[tex]a_n = (-1)^n*n^3+1[/tex]
[tex]a_1 = (-1)^1*1^3+1[/tex]
[tex]a_1 = 0[/tex]
and plug in n = 2 to get
[tex]a_n = (-1)^n*n^3+1[/tex]
[tex]a_2 = (-1)^2*2^3+1[/tex]
[tex]a_2 = 9[/tex]
and so on. I'll let you check the other terms
--------------------
Let's find the terms a8,a9,a10,a11
This is simply a matter of plugging n = 8, n = 9, n = 10, and n = 11
Plug in n = 8
[tex]a_n = (-1)^n*n^3+1[/tex]
[tex]a_8 = (-1)^8*8^3+1[/tex]
[tex]a_8 = 513[/tex]
Repeat for n = 9
[tex]a_n = (-1)^n*n^3+1[/tex]
[tex]a_{9} = (-1)^9*9^3+1[/tex]
[tex]a_{9} = -728[/tex]
Repeat for n = 10
[tex]a_n = (-1)^n*n^3+1[/tex]
[tex]a_{10} = (-1)^{10}*10^3+1[/tex]
[tex]a_{10} = 1001[/tex]
Repeat for n = 11
[tex]a_n = (-1)^n*n^3+1[/tex]
[tex]a_{11} = (-1)^{11}*11^3+1[/tex]
[tex]a_{11} = -1330[/tex]
What is the area of a trapezoid with height 5 m and bases 8 m and 1 m?
A. 6.5 m^2
B. 22.5 m^2
C. 24 m^2
D. 45 m^2
If anyone has the answers to the rest, that would be great!
Answer:
B. 22.5m^2
Step-by-step explanation:
To find the area of a trapezoid, you must use the formula:
1/2 × height × (base 1+ base 2)
1. 1/2 × 5m × (8+1)
2. 1/2 x 5m x (9)
3. Switch it around to make it easier to solve
5m × 9× 1/2 (We can do this because of the commutative property.)
4. 45m × 1/2 = 45 ÷ 2 = 22.5m^2
In the context of the problem, this means that the area of the trapezoid is 22.5m^2.
he sum of two numbers is 58. The difference of the two numbers is 32.
What are the two numbers?
Let x be the larger number and y be the smaller number.
Write an equation that expresses the information in the sentence "The sum of two numbers is 58."
Answer:x+y=58
Step-by-step explanation:
Sum means addition
50 points
Kanna has 2 red pens, 4 black pens, 3 blue pens, 1 purple pen. What is the chance Kanna pulls one of her black pens. Write you answer in a fraction and percentage.
[Note:False answers will be reported]
Answer:
4 out of 10 or 4/10 is my answer
Answer:
The fraction will be 4/10, or 2/5.
The percentage will be 40%.
Step-by-step explanation:
The fraction and percentage will be the number of black pens divided by the total number of pens.
We can find the total number of pens by adding all the pens in each color together.
2 + 4 + 3 + 1 = 10
The total number of pens is 10. The number of black pens is 4.
The fraction will be 4/10, or 2/5.
The percentage will be 40%.
I hope this helps. Happy studying. :)
A flag post 10 meters long is fixed on top of a tower. From a point on horizontal ground, the angles of elevation of the top and bottom of the flag post are 40 degrees and 33 degrees respectively. Calculate:
a) The height of the tower
b) The shortest distance from the point on the ground to the top of the flag post
Answer:
Tan33=x/y
y= x/Tan33
Tan40=(10+x)/y
y= (10+x)/Tan40
Therefore
x/Tan33 = (10+x)/Tan40
xTan40-xTan33 =10Tan33
x= 10Tan33/(Tan40-Tan33)
x=34.2m
Step-by-step explanation:
Find the cotangent of both angle A and angle B.
Thank you!
Answer: tangent of A = 2.4
Cotangent of B = 0.4167
Step-by-step explanation:
Answer:
[tex]\displaystyle \frac{5}{12} = cot∠B \\ 2\frac{2}{5} = cot∠A[/tex]
Step-by-step explanation:
[tex]\displaystyle \frac{OPPOSITE}{HYPOTENUSE} = sin\:θ \\ \frac{ADJACENT}{HYPOTENUSE} = cos\:θ \\ \frac{OPPOSITE}{ADJACENT} = tan\:θ \\ \frac{HYPOTENUSE}{ADJACENT} = sec\:θ \\ \frac{HYPOTENUSE}{OPPOSITE} = csc\:θ \\ \frac{ADJACENT}{OPPOSITE} = cot\:θ \\ \\ \frac{10}{24} = cot∠B → \frac{5}{12} = cot∠B \\ \\ \frac{24}{10} = cot∠A → 2\frac{2}{5} = cot∠A[/tex]
I am joyous to assist you anytime.
Which of the following sets of numbers could be the lengths of the sides of a triangle? A. 1 mi, 9 mi, 10 mi B. 8 mi, 9 mi, 2 mi C. 1 mi, 9 mi, 11 mi D. 8 mi, 9 mi, 17 mi
Answer:
Option B. 8 mi, 9 mi, 2 mi
Step-by-step explanation:
The option A doesn't have a set of numbers which could be the lengths of the sides of a triangle. The numbers 1,9,10 mean that the longest side is exactly the sum of the others. The only possible way is they lie in the same line, no triangle is formed
Option C gives the numbers 1,9,11. It's impossible to have a side of 11 when you have the sum of the others less than 11. The maximum extension of the other sides (forming a line) won't be enough to reach the length of 11
Option D is also infeasible for the same reason as the option A. The three lines must be aligned to be connected in its extremes
Option B is the only one who can provide a set of possible lengths of a triangle since the sum of the shortest sides is greater than the third. If we open wide enough the angle between the 2 mi side and the 8 mi side, we would eventually connect the 9 mi side and form a triangle
10. What happens if the insured tenant and the insurance company fail to agree on the amo
a. Either the tenant or the company can request an appraisal, so that an impartial thir
request an appraisal, so that an impartial third party determines
the amount of loss
b. The insurance policy becomes null and void
The insurance company is forced to pay the current online market price for the item
d. The landlord or owner of the building must make up the difference in the disputed value
Answer:
A is the answer
Step-by-step explanation:
If you fail to agree on the actual cash value, amount of loss, or cost of repair or replacement, either can make a written demand for appraisal. ... The two appraisers will then set the amount of loss, stating separately the actual cash value and loss to each item.
When the insured tenant and the insurance company fail to agree on the amount of loss; Choice A is what happens: Either the tenant or the company can request an appraisal, so that an impartial third party determines the amount of loss.
Discussion:
Situations such as in the question may arise when quantifying the amount of loss in an insurance situation.
In such scenarios; the best option is for either the tenant or the company can request an appraisal, so that an impartial third party determines the amount of loss.
The essence of this, is to ensure fairness in quantification of the amount of loss.
Read more on insurance:
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Diep buys a loaf of bread 65 centimeters long. For lunch every afternoon, he cuts 15 centimeters of bread for his sandwich. Diep wants to determine the length of the loaf of bread, l, after d days. What is the equation of the scenario?
Is the graph of the equation continuous or discrete? l = 65 – 15d; discrete l = 65 – 15d; continuous 65 = l – 15d; discrete 65 = l – 15d; continuous
Answer:
The equation is I = 65 - 15d and it's continuous
Step-by-step explanation:
First, let's discart the options. The last two options cannot be because if you solve for I in those equations, you'll get the following:
65 = I - 15d
I = 65 + 15d
Now, suppose that after 1 day, you want to know the length of the bread:
I = 65 + 15(1) = 80
This is impossible because the bread is being cut and it's not growing each afternoon. Therefore these options, wheter is discrete or continuous are discarted.
The correct equation to use is then
I = 65 - 15d
Now, how do you know if the graph is continuous or discrete?. A graph is continuous when all the points belonging to a set, can take any value within an interval. A discrete graph all the values belonging to a set, are distinct and separate one of another, in other words, the values are unconnected.
In this case, if you graph this equation, you have the following (see attached graph)
As you can see, all the values are connected and continuous.
Answer : B
Step-by-step explanation:
Affect or use is 1/8 of a barrel of raisins in each batch of granola bars yesterday the factory use 1/2 of a barrel of raisins how many batches of granola bars did the factory made yesterday?
Answer:
Factory made 4 batches of granola bars yesterday.
Step-by-step explanation:
Given:
1 batch of granola bar is made of 1/8 barrel of raisins.
1/8 barrels can be rewritten as 0.125 barrels.
Hence we can say 1 batch of granola bar is made of 0.125 barrels.
Also Given:
Yesterday Factory used 1/2 barrel of raisins.
1/2 barrels can be rewritten as 0.5 barrels.
Hence we need to find how much batches of granola bars were made using 0.5 barrels of raisins.
Now,
For 0.125 barrels raisins = 1 batch of granola bar
for 0.5 barrels of raisins = Batches of granola bar for 0.5 barrels of raisins
By Using Unitary method we get;
Batches of granola bar for 0.5 barrels of raisins = [tex]\frac{1\times 0.5}{0.125}=4[/tex]
Hence Factory made 4 batches of granola bars yesterday.
For the month of JanuaryJanuary in a certain city, 51% of the days are cloudycloudy. Also in the month of JanuaryJanuary in the same city, 252% of the days are cloudycloudy and foggyfoggy. What is the probability that a randomly selected day in JanuaryJanuary will be foggyfoggy if it is cloudycloudy?
Answer: Our required probability is 0.48.
Step-by-step explanation:
Since we have given that
Probability that days are cloudy in January = 51%
Probability that days are cloudy and foggy = 25%
So, we need to find the probability that a randomly selected day in January will be foggy if it is cloudy.
So,P( Foggy|cloudy) is given by
[tex]\dfrac{P(Foggy\cap cloudy)}{P(cloudy)}\\\\=\dfrac{25}{51}\\\\=0.48[/tex]
Hence, our required probability is 0.48.
Can someone explain this tree diagram for me? I understand why it’s 0.7 and why it’s 0.3 but what I don’t understand why it’s 0.4 shouldn’t it be 0.1? Shouldn’t it be 0.5 instead of 0.2?
Answer:
66% have graduated within five years.
Step-by-step explanation:
It is given that 70% of freshmen went to public schools. Then the rest 30% i.e., [tex]$ \frac{30}{100} = 0.3 $[/tex] should have gone to other schools.
Now, the number the freshmen in public schools is considered as 100% or 1.
60% of the freshmen from public schools have graduated means out of the total freshmen from public schools, 60% of them have graduated. That is why it is denoted as 0.6 and those not graduated as 0.4.
Note that 60% of total students have graduated.
Let us assume there were 100 students initially. Then 70 students went to public school. Number of students graduated = 60%
[tex]$ \implies \frac{60}{100} \times 70 = 42 $[/tex]
That is 42 students have passed from public school.
Now, the ones in other schools:
80% of them have graduated in other schools. That means out of total students 80% of them have graduated.
That means [tex]$ \frac{80}{100} \times 30 = 24 $[/tex]
24 students from other schools have passed.
Therefore, totally 66 students have passed. i.e., 66 percent have passed.
The random variable X is normally distributed with mean 5 and standard deviation 25. The random variable Y is defined by Y = 2 + 4X. What are the mean and the standard deviation of Y ? The mean is 20 and the standard deviation is 102.
A) The mean is 20 and the standard deviation is 50.
B) The mean is 22 and the standard deviation is 102.
C) The mean is 22 and the standard deviation is 100.
D) The mean is 22 and the standard deviation is 50.
Answer:
C) The mean is 22 and the standard deviation is 100.
Step-by-step explanation:
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".
The expected value of a random variable X is the n-th moment about zero of a probability density function f(x) if X is continuous, or the weighted average for a discrete probability distribution, if X is discrete.
The variance of a random variable X represent the spread of the possible values of the variable. The variance of X is written as Var(X).
If [tex] X\ sim N(\mu_x =5, \sigma_x =25)[/tex]
And the random variable Y =2+4X.
If we are interested in find the mean and the standard deviation for this new variable we need to apply the concepts of expected value and Variance of random variables.
Using the concept of expected value we have:
[tex]E(Y) =E(2+4X) = E(2) +E(4X)= 2+ 4E(X) =2+4(5) =2+20=22[/tex]
So on this case the [tex]E(Y) =\mu_Y =22[/tex]
Using the concept of variance we have:
[tex]Var(Y)=Var(2+4x)=Var(2)+Var(4X)+2Cov(2,4X)[/tex]
But since 2 is a constant we don't have variance for this and the [tex]Cov(2,4x)=0[/tex] because the covariance of a random variable with a constant is zero. So applying these concepts we have:
[tex]Var(Y)= Var(4x)=4^2 Var (X)= 16 \sigma^2_x =16(25^2)=10000[/tex]
And then if we need the standard deviation we just need to take the square root:
[tex]sd(Y) = \sqrt{10000}=100[/tex]
So the best option for this case would be:
C) The mean is 22 and the standard deviation is 100.
Answer:
Option c) is correct.
Step-by-step explanation:
Given :
[tex]\mu_x = 5[/tex] and [tex]\sigma_x = 25[/tex]
Y = 2 + 4X
Calculation:
This problem can be solved by using concept of expected value and variance of random variables.
By expected value concept,
[tex]\rm E(Y) = E(2 + 4X)= E(2) + E(4X)= 2 + 4E(X)=2+4(5)=22[/tex]
Therefore, [tex]\mu_y = 22[/tex]
By variance concept,
[tex]\rm Var(Y)= Var(2+4X)=Var(2)+Var(4X)+2Cov(2,4X)[/tex]
[tex]\rm Cov(2,4X)=0[/tex]
Var(2) = 0
Therefore,
[tex]\rm Var(Y) = Var(4X)= 4^2Var(X)= 16\sigma_x^2=16(25^2)=10000[/tex]
Therefore,
Standard deviation(Y) = [tex]\sqrt{10000}[/tex] = 100
Hence, option c) is correct.
For more information, refer the link given below
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Abby Matthew store manager for Sears does not know how to price a refrigerator that cost $900 Abby knows her boss wants a 40% markup on cost When should the price of the refrigerator be?
Answer:
The 40% marked up price of refrigerator is $1260.
Step-by-step explanation:
The cost price of the refrigerator = $900
Now, the mark up should be 40%
Calculating the markup on the cost price , we get
40 % of $900 = [tex]\frac{40}{100} \times 900 = 360[/tex]
or, 40 % mark up = $360
Now, the Marked up cost = Cost Price + Marked up Price
= $900 + $360 = $1260
Hence, the 40% marked up price of refrigerator is $1260.
How many pentagons can you make using five points as vertices?
Answer:
56 pentagon.
Step-by-step explanation:
Here is the complete question: Eight point lies on the circle. How many pentagons can you make using five points as vertices?
Given: Five points on vertices.
Using the combination formula to find the number of pentagon.
[tex]_{r}^{n}\textrm{C} = \frac{n!}{r!(n-r)!}[/tex]
⇒ [tex]_{8}^{5}\textrm{C}= \frac{8!}{5!(8-5)!}[/tex]
⇒[tex]_{8}^{5}\textrm{C}= \frac{8!}{5!\times 3!} \\\\_{8}^{5}\textrm{C} = \frac{8\times 7\times 6\times5\times4\times3\times2\times1}{5\times4\times3\times2\times1\times3\times2\times1} = \frac{336}{6}[/tex]
∴ [tex]_{8}^{5}\textrm{C}= 56[/tex]
∴ With eight point lies on circle, we can make 56 pentagons using five points as vertices
Which is proportional to ¾?
5/6
6/8
6/7
8/9
Answer:
6:8
Step-by-step explanation:
A bottle contains a label stating that it contains pills with 500 mg of vitamin C, and another bottle contains a label stating that it contains pills with 325 mg of aspirin When testing claims about the mean contents of the pills, which would have more serious implications: rejection of the vitamin C claim or rejection of the aspirin claim? Is it wise to use the same significance level for hypothesis tests about the mean amount of vitamin C and the mean amount of aspirin? Rejection of the claim about________ is more serious because the wrong_________ dosage could cause more serious adverse reactions than a wrong_______dosage. It would be wise to use a__________ significance level for testing the claim about the aspirin.
Answer:
Step-by-step explanation:
Rejection of aspirin argument is more dangerous because the incorrect dosage of aspirin may cause more severe adverse reactions than the incorrect dosage of vitamin C. It would be prudent to use a lower level of significance to test the aspirin argument.
Maya charges $9.50 an hour for peertutoring. One week last mouth she worked 5 hours and the next week she worked 8 hours. How much did maya earn tutoring those two weeks?
Hey, can I please get some help with this? It shouldn’t be too hard, thanks!
Answer:
(x -3)(x+3)(2x +1)(x -1)(x +1)(x +3)(2x -1)(2x +1)(x -4)Step-by-step explanation:
A) 2x³ +x² -18x -9 = x²(2x +1) -9(2x +1) = (x² -9)(2x +1) = (x -3)(x+3)(2x +1)
__
B) x³ +3x² -x -3 = x²(x +3) -1(x +3) = (x² -1)(x +3) = (x -1)(x +1)(x +3)
__
C) 4x³ -16x² -x +4 = 4x²(x -4) -1(x -4) = (4x² -1)(x -4) = (2x -1)(2x +1)(x -4)
_____
In each case, the third-level factoring mentioned in step 4 is the factoring of the difference of squares: a² -b² = (a -b)(a +b).
_____
The step-by-step is exactly what you need to do. It is simply a matter of following those instructions. You do have to be able to recognize the common factors of a pair of terms. That will be the GCF of the numbers and the least powers of the common variables.
Suppose the scores of students on a Statistics course are Normally distributed with a mean of 563 and a standard deviation of 37. What percentage of the students scored between 563 and 637 on the exam?
Answer:
47.72% of students scored between 563 and 637 on the exam .
Step-by-step explanation:
The percentage of the students scored between 563 and 637 on the exam
= The percentage of the students scored lower than 637 on the exam -
the percentage of the students scored lower than 563 on the exam.
Since 563 is the mean score of students on the Statistics course, 50% of students scored lower than 563. that is P(x<563)=0.5
P(x<637)=P(z<z*) where z* is the z-statistic of the score 637.
z score can be calculated using the formula
z*=[tex]\frac{X-M}{s}[/tex] where
X =637M is the mean score (563)s is the standard deviation of the score distribution (37)Then z*=[tex]\frac{637-563}{37}[/tex] =2
P(z<2)=0.9772, which means that 97.72% of students scored lower than 637 on the exam.
As a Result, 97.72%-50%=47.72% of students scored between 563 and 637 on the exam