Which of the following is an example of a subjective​ probability? A. Although College A has never played College B in​ basketball, a sports analyst believes there is a 0.8 probability that A will beat B in their upcoming game. B. Based on many years of​ data, an automobile insurance company estimates the probability that a randomly chosen​ 20-year old driver will have an accident during his 20th year as 0.001. C. After examining a deck of cards to determine that there are 52 cards of the correct suits and​ values, a card player says the probability of drawing the 7 of hearts is​ 1/52. D. After examining a coin to determine that it is an unaltered coin produced by the U.S.​ Mint, a gambler says the probability of a coin flip coming up heads is​ 1/2.

Answer:

See answer below

Step-by-step explanation:

Hi there,

The formula above is not in point-slope form, which is of the form:

[tex]y = mx +b[/tex]

So, just simply put it in point-slope form by:

1. distributing the 1/3 term into the parentheses

[tex]y-4=\frac{1}{3}x -\frac{5}{3}[/tex]

2. add 4 to the right side of the equation to isolate y

[tex]y = \frac{1}{3} x-\frac{5}{3} +4 \\ = \frac{1}{3} x-\frac{5}{3}+\frac{12}{3} =\frac{1}{3} x+\frac{7}{3} \\ y =\frac{1}{3} x+\frac{7}{3}[/tex]

Adding 4 as 12/3 with common denominator, the resulting equation is now in point-slope form.

The "point" refers to y-intercept, which is 7/3, while the slope is the coefficient of x, which is 1/3.

thanks,

The point is (5, 4) and the slope is 1/3 in the given equation. The point-slope form of a linear equation is y - y1 = m(x - x1).

The point-slope form of a linear equation is y - y1 = m(x - x1).

Given the equation y - 4 = 1/3(x - 5), the point is (5, 4) and the slope is 1/3.

Therefore, the point is (5, 4) and the slope is 1/3.

Answer:

choice a.)  11m

Step-by-step explanation:

2(5m) + m  =  10m + m = 11m

Answer:

3/46

Step-by-step explanation:

Answer:

88

Step-by-step explanation:

this is my answer it will help you

Answer:

d. 0.0948 ± 4.032(0.0279)

Step-by-step explanation:

A 99% confidence interval for the coefficient of promotional expenditures is, First, compute the t critical value then find confidence interval.

The t critical value for the 99% confidence interval is,  

The sample size is small and two-tailed test. Look in the column headed es = 0.01 and the row headed in the t distribution table by using degree of freedom is here

for (n-2=5) degree of freedom and 99% confidence ; critical t =4.032

therefore 99% confidence interval for the slope =estimated slope -/+ t*Std error

= 0.094781123 -/+ 4.032* 0.027926367 = -0.017822 to 0.207384

Answer:

Check the explanation

Step-by-step explanation:

The details of the given samples are as follows:

Low dose. Number numbers of rats 20

The standard deviation . [tex]S_1[/tex]=54g

Control:

Number of rats [tex]N_2[/tex]=23

The standard deviation [tex]S_1[/tex]=32g  

[tex]H_0[/tex]: there is no more variability in low — dose weight gains than in the control weight gins  

[tex]H_1[/tex]: There is mere In-viability in low — dose weight gains than in control weight gains  

>4 The level of significance.

a= 0.05 The test statistic to test the above hypothesis is Larger variance Smaller variance  

The critical value of F (19.22) dr and at 0.05

significance level is 2.0837

The P-Value is 0.01 The test significance value is greater the the critical level is 20837.

Also. the 8-value is less then the significance level Hence, we reject the null hypothesis.

Therefore, we conclude that there is sufficient evidence to conclude that there is more variability in low — dose weight gains than in control weight gains .

Answer:

10 dimes.

Step-by-step explanation:

Let n represent number of nickels, d represent number of dimes and q represent number of quarters.

We have been given that there are 57 coins in all. We can represent this information in an equation as:

[tex]n+d+q=57...(1)[/tex]        

We are also told that the value of all coins is $4.55. We can represent this information in an equation as:

[tex]0.05n+0.10d+0.25q=4.55...(2)[/tex]

The number of nickels is 7 short of being three times the sum of the number of dimes and quarters together. We can represent this information in an equation as:

[tex]n+7=3(d+q)...(3)[/tex]

From equation (1), we will get:

[tex]d+q=57-n[/tex]

Substituting this value in equation (3), we will get:

[tex]n+7=3(57-n)[/tex]

[tex]n+7=171-3n[/tex]

[tex]n+3n+7-7=171-7-3n+3n[/tex]

[tex]4n=164[/tex]

[tex]\frac{4n}{4}=\frac{164}{4}[/tex]

[tex]n=41[/tex]

Therefore, there are 41 nickels in the bank.

[tex]d+q=57-n...(1)[/tex]  

[tex]d+q=57-41...(1)[/tex]

[tex]d+q=16...(1)[/tex]

[tex]q=16-d...(1)[/tex]

Upon substituting equation (1) and value of n in equation (2), we will get:

[tex]0.05(41)+0.10d+0.25(16-d)=4.55[/tex]

[tex]2.05+0.10d+4-0.25d=4.55[/tex]

[tex]6.05-0.15d=4.55[/tex]

[tex]6.05-6.05-0.15d=4.55-6.05[/tex]

[tex]-0.15d=-1.5[/tex]

[tex]\frac{-0.15d}{-0.15}=\frac{-1.5}{-0.15}[/tex]

[tex]d=10[/tex]

Therefore, there are 10 dimes in the bank.

Answer:

  D. The axis of symmetry is the y-axis.

Step-by-step explanation:

The vertex is at coordinates (0, 3). Since this parabola opens vertically, its axis of symmetry is the x=coordinate of the vertex: x = 0. That is the equation of the y-axis.

The axis of symmetry is the y-axis.

Answer:

The matched pair t-interval for a population mean difference.

Step-by-step explanation:

The matched pair design (Used in the paired t-test or paired-samples t-test) compares the two means associated groups to conclude if there is a statistically significant difference amid these two means.

A (1 - α)% confidence interval for matched pair design can be used to determine whether there is any difference between the two groups of data.

We use the paired t-interval if we have two measurements on the same item, person or thing. We should also use this interval if we have two items that are being measured with a unique condition.

For instance, an experimenter tests the effect of a medicine on a group of patients before and after giving the doses.  

In this case a study was conducted to determine the effectiveness of a certain adult reading program.

The selected adults will be given a pretest before beginning the program and a post-test after completing the program. Then the difference between the two scores would be computed for each adult.

This is an example of matched pair design.

To analyze this data, i.e. to determine whether the program is effective or not, compute the matched pair t-interval for a population mean difference.

The subject of the question is Statistics, which pertains to a before-and-after study design. It involves the use of a pretest and posttest to evaluate the effectiveness of an adult reading program. Proper random sample selection is key to avoid bias and increase study validity.

The study mentioned in the question is under the subject of Statistics, particularly pertaining to Study Design and Data Analysis. This type of observational study is known as a before-and-after study or time series. It involves recording observations on variables of interest over a period of time before and after a treatment or intervention.

In this scenario, the intervention is the adult reading program. The observations are done in the form of a pretest (before the intervention) and a posttest (after the intervention). The difference between the results of the posttest and pretest is then calculated to determine if there has been an improvement, and if so, how significant that improvement is.

Such study designs have seen ample usage in education, health sciences, and various other fields. It's important to highlight that in this study design, it's critical to have a well-defined random sample to avoid selection bias and increase the generalizability of the study findings.

https://brainly.com/question/31799021

#SPJ12

Answer:

[tex] X_m = \frac{A_x +B_x}{2}= \frac{1+B_x}{2}= 2[/tex]

And we can solve for [tex] B_x[/tex] and we got:

[tex] 1+B_x = 4[/tex]

[tex]B_x = 3[/tex]

[tex] Y_m = \frac{A_y +B_y}{2}= \frac{2+B_y}{2}= 5[/tex]

And we can solve for [tex] B_x[/tex] and we got:

[tex] 2+B_y = 10[/tex]

[tex]B_y = 8[/tex]

So then the coordinates for B are (3,8)

Step-by-step explanation:

For this case we know that the midpoint for the segment AB is (2,5)

And we know that the coordinates of A are (1,2)

We know that for a given segment the formulas in order to find the midpoint are given by:

[tex] X_m = \frac{A_x +B_x}{2}= \frac{1+B_x}{2}= 2[/tex]

And we can solve for [tex] B_x[/tex] and we got:

[tex] 1+B_x = 4[/tex]

[tex]B_x = 3[/tex]

[tex] Y_m = \frac{A_y +B_y}{2}= \frac{2+B_y}{2}= 5[/tex]

And we can solve for [tex] B_x[/tex] and we got:

[tex] 2+B_y = 10[/tex]

[tex]B_y = 8[/tex]

So then the coordinates for B are (3,8)

The coordinates of point B are (4, 8).

To find the coordinates of point B, we can use the midpoint formula. The midpoint formula states that the coordinates of the midpoint M(xm, ym) of a line segment with endpoints A(x1, y1) and B(x2, y2) are given by:

xm = (x1 + x2) / 2

ym = (y1 + y2) / 2

In this case, we are given that the midpoint M is (2, 5) and A is (1, 2). We can substitute these values into the formula:

2 = (1 + x2) / 2

5 = (2 + y2) / 2

Now, we can solve for x2 and y2:

x2 = 4

y2 = 8

Therefore, the coordinates of point B are (4, 8).

https://brainly.com/question/30227780

#SPJ3

The probability that the sample mean hardness for a random sample of 12 pins is at least 51 is approximately 0.0228.

To determine the probability, we can use the central limit theorem. Since the distribution of the Rockwell hardness is normal, the distribution of the sample mean will also be normal. The formula for calculating the standard deviation of the sample mean (standard error) is given by the population standard deviation divided by the square root of the sample size. In this case, the standard error is calculated as 1.3 / sqrt(12), which is approximately 0.3746.

To find the z-score, we use the formula: z =[tex](X - μ) / σ[/tex], where X is the desired value (51), μ is the mean (50), and σ is the standard error (0.3746). Plugging in these values, we get a z-score of approximately 2.6744.

Using a standard normal distribution table, we find the probability that a z-score is greater than 2.6744 is approximately 0.0057. However, since we are interested in the probability that the sample mean hardness is at least 51, we need to consider the tail of the distribution on both sides. Therefore, the final probability is[tex]2 * 0.0057[/tex] = 0.0114.

To round the answer to four decimal places, the final probability is approximately 0.0228.

Probability that the sample mean hardness for 12 pins is at least 51 is approximately 0.0038.

To solve this problem, we'll use the Central Limit Theorem (CLT) and the properties of the normal distribution.

Given:

- Population mean[tex](\( \mu \))[/tex] = 50

- Population standard deviation [tex](\( \sigma \))[/tex] = 1.3

- Sample size (( n )) = 12

- Desired sample mean[tex](\( \bar{x} \)) = 51[/tex]

The CLT states that the distribution of sample means approaches a normal distribution as the sample size increases, regardless of the shape of the population distribution.

For a sample size of 12, we can use the following formula to calculate the standard error[tex](\( \text{SE} \))[/tex]:

[tex]\[ \text{SE} = \frac{\sigma}{\sqrt{n}} \][/tex]

Substitute the given values:

[tex]\[ \text{SE} = \frac{1.3}{\sqrt{12}} \][/tex]

[tex]\[ \text{SE} \approx \frac{1.3}{3.4641} \][/tex]

[tex]\[ \text{SE} \approx 0.3749 \][/tex]

Now, we need to find the z-score for the sample mean of 51 using the standard normal distribution formula:

[tex]\[ z = \frac{\bar{x} - \mu}{\text{SE}} \][/tex]

Substitute the given values:

[tex]\[ z = \frac{51 - 50}{0.3749} \][/tex]

[tex]\[ z = \frac{1}{0.3749} \][/tex]

[tex]\[ z \approx 2.6679 \][/tex]

Now, we look up the probability corresponding to this z-score in the standard normal distribution table.

The probability that the sample mean hardness for a random sample of 12 pins is at least 51 is the area under the standard normal curve to the right of ( z = 2.6679 ).

Consulting a standard normal distribution table or using statistical software, we find:

[ P(Z > 2.6679) ]

This probability represents the area to the right of ( z = 2.6679 ).

Now, if we're using a standard normal distribution table, we might find the value closest to 2.67 or 2.67 itself, then look up the corresponding probability.

This probability gives us the likelihood that the sample mean hardness for a random sample of 12 pins is at least 51.

My guess is that it is 2/12 chance to get it, or 16.6

Answer:

1/36

Step-by-step explanation:

Multiply the two independent probabilities to find the compound probability.

P(3 and 5) =

1

6

×

1

6

=

1

36

Answer:

Parallelograms are shapes that have four sides with two sides that are parallel. For example, some shapes that are parallelograms are squares, rectangle, rhombus and rhomboid.  

Step-by-step explanation:

No explanation :)

Final answer:

A parallelogram is a quadrilateral with parallel and congruent opposite sides, congruent opposite angles, and diagonals that bisect each other.

Explanation:

A parallelogram is a four-sided polygon, also known as a quadrilateral, where opposite sides are parallel and equal in length. There are several properties that define a parallelogram:

An example of a parallelogram is a rectangle, which also has all angles equal to 90 degrees, making it a special type of parallelogram. Another example is a rhombus, which has all sides of equal length. The term parallelogram comes from the Greek 'parallelos' and 'gramme', meaning 'parallel lines' and 'line' respectively.

Complete Question:

From a point along a straight road, the angle of elevation to the top of a hill is 33° . A distance of 200 ft farther down the road, the angle of elevation to the top of the hill is 20°. How high is the hill?

Answer:

The hill is 165.87 ft high

Step-by-step explanation:

Check the file attached below for a pictorial understanding of the question

[tex]tan \theta = \frac{opposite}{Adjacent}[/tex]

From ΔABC

[tex]tan 33 = \frac{y}{x} \\[/tex]

[tex]y = x tan 33[/tex]..........(1)

From ΔABD

[tex]tan 20 = \frac{y}{x + 200} \\[/tex]

[tex]y = (x + 200) tan 20[/tex]............(2)

Equating (1) and (2)

[tex]x tan 33 = (x+200) tan20\\xtan33 = xtan20 + 200tan20\\0.649x = 0.364x + 72.794\\0.649x - 0.364x = 72.794\\0.285x = 72.794\\x = 72.794/0.285\\x = 255.42 ft[/tex]

Substitute the value of x into equation (1)

[tex]y = 255.42 tan 33[/tex]

y = 165.87 ft

The height of the hill is 550 feet.

Given:

- [tex]\(\theta_1 = 31^\circ\)[/tex]

- [tex]\(\theta_2 = 24^\circ\)[/tex]

- [tex]\(d = 320\) feet[/tex]

We use the formula for the height of the hill \(h\):

[tex]\[h = \frac{d \tan(\theta_2) \tan(\theta_1)}{\tan(\theta_1) - \tan(\theta_2)}\][/tex]

First, we calculate [tex]\(\tan(31^\circ)\)[/tex] and  [tex]\(\tan(24^\circ)\)[/tex]:

[tex]\[\tan(31^\circ) \approx 0.6009\][/tex]

[tex]\[\tan(24^\circ) \approx 0.4452\][/tex]

Now, substitute these values into the formula:

[tex]\[h = \frac{320 \times 0.4452 \times 0.6009}{0.6009 - 0.4452}\][/tex]

Calculate the numerator:

[tex]\[320 \times 0.4452 \times 0.6009 \approx 85.676256\][/tex]

Calculate the denominator:

[tex]\[0.6009 - 0.4452 \approx 0.1557\][/tex]

Now, divide the numerator by the denominator:

[tex]\[h = \frac{85.676256}{0.1557} \approx 550.41\][/tex]

Rounding to the nearest foot, the height of the hill is:

550 feet.




Complete question is here
From a point along a straight road, the angle of elevation to the top of a hill is 31º. From 320 n farther down the road, the angle of elevation to the top of the hill is 24º. How high is the hill? Round to the nearest foot.

Answer:

Hence the expected value for the contractor for sales is 15,300 $.

Step-by-step explanation:

Given:

Winning $27000 is 0.7 and losing 12000 $ of it about 0.3

To find :

Expected value for the contractor for sales.

Solution:

Th expected value is the average occurred  of the event.

{Suppose

a series of number like 10,30,30,30,30,60,78.

for this  expected value will be

(10+30+30+30+30+60+78+78) / 8

=10(1/8)+30(4/8)+60(1/8)+78(2/8).

78 ,10 ,30 and 60 are just like cost and 1/8 ,4/8,2/8 are probabilities of respective cost.

}

Similar for given values

Expected value with probability is =

Winning probability *cost of winning +(-losing probability * losing cost)

losing means negative impact on value so it is negative

=27000*0.7-12000*0.3

=18900-3600.

=15300 $.

Answer:

a, a, b,b

Step-by-step explanation:

Upper bound: 475+50= 525

lower bound: 475-50= 425

Cp= (Upper bound-lower bound)/ 6σ

Cp= (525-525)/ (6× 50)

Cp= 0.33

Cpk is minimum of two following values: (Upper bound-mean)/ 3σ, (mean -lower bound)/ 3σ

Cpk in this case is: Min (0.33,0.33)

The Cp and Cpk values are  calculated from the actual process values. Here target Cp and Cpk value is 0.33

Roster's Chicken can monitor their caloric content using an X-chart with control limits calculated at either three or four standard deviations from the mean. The analysis reveals that grilled chicken breast is more energy-dense than tortilla chips. After consuming 16 tortilla chips, significant portions of the daily values (DV) for fat, sodium, and fiber remain for other meals.

Control Limits for X-Chart

To design an X-chart for monitoring the caloric content of Roster's Chicken, we need to establish the upper and lower control limits based on the given parameters.

Part a) Control Limits with Four Standard Deviations

The average caloric content of the chicken breast is 420 calories with a standard deviation of 20 calories. For a sample size of 25, the standard error is:

Standard Error = σ / √n = 20 / √25 = 20 / 5 = 4

Therefore, the four standard deviation limits from the target mean of 420 calories are:

Upper Control Limit (UCL) = 420 + 4 * 4 = 420 + 16 = 436 calories

Lower Control Limit (LCL) = 420 - 4 * 4 = 420 - 16 = 404 calories

Part b) Control Limits with Three Standard Deviations

Using the same standard error, the three standard deviation limits are:

Upper Control Limit (UCL) = 420 + 3 * 4 = 420 + 12 = 432 calories

Energy Density Comparison

A serving of grilled chicken breast (4 oz) has about 190 calories. In comparison, 16 tortilla chips typically have around 140 calories. Chicken breast is more energy-dense because it has more calories per ounce compared to tortilla chips, which makes it a denser source of calories.

Percentage Daily Values (DV) in 16 Tortilla Chips

If 16 tortilla chips contribute 10% DV of fat, 8% DV of sodium, and 4% DV of dietary fiber, the remaining percentages for a healthy diet would be:

• Fat: 100% - 10% = 90% DV remaining

• Sodium: 100% - 8% = 92% DV remaining

• Fiber: 100% - 4% = 96% DV remaining

Complete Question:- Roster's Chicken advertises "lite" chicken with 30% fewer calories than standard chicken. When the process for "lite chicken breast production is in control, the average chicken breast contains 420 calories, and the standard deviation in caloric content of the chicken breast population is 20 calories. Roster's wants to design an X-chart to monitor the caloric content of chicken breasts, where 25 chicken breasts would be chosen at random to form each sample. a) What are the lower and upper control limits for this chart? These limits are chosen to be four standard deviations from the target. Upper Control Limit (UCL): 436 calories (enter your response as an integer) Lower Control Limit (LCL): 404 calories (enter your response as an integer) b) What are the limits with three standard deviations from the target? Upper Control Limit (UCL): calories (enter your response as an integer)

Answer:

17.67 cm

Step-by-step explanation:

[tex]\sqrt{a^2+b^2}[/tex] = x

16^2 = 256

7.5^2 = 56.25

Add.

256 + 56.25 = 312.25

[tex]\sqrt{312.25}= 17.67[/tex]

The missing side of the triangle is x = 17.67 cm

If ABC is a triangle with AC as the hypotenuse and angle B with 90 degrees then we have:

|AC|^2 = |AB|^2 + |BC|^2    

where |AB| = length of line segment AB. (AB and BC are rest of the two sides of that triangle ABC, AC being the hypotenuse).

The Pythagorean theorem formula:

a² + b² = c²

Replacing by the values we have;

16² + 7.5² = x²

x² = 256 + 56.25

x²  = 312.25

x = √312.25 cm

x = 17.67 cm

Therefore, the correct answer is x = 17.67 cm

Learn more about Pythagoras theorem here:

brainly.com/question/12105522

#SPJ2

Answer:

  B = (7, 4)

Step-by-step explanation:

  B = 2M -A = 2(2.5, -1.5) -(-2, -7)

  B = (5+2, -3+7)

  B = (7, 4)

__

Derivation

You know the midpoint is calculated from ...

  M = (A+B)/2

Solving for B, we get ...

  2M = A+B

  B = 2M-A . . . . the formula we used above

Answer:

Give more points

Step-by-step explanation:

Answer:

area = 1500× 750 = [tex]1125000 m^2[/tex]

Step-by-step explanation:

we know area of rectangle  

for length = l m

and width = b m

[tex]A = lb[/tex]  

and perimeter

[tex]Perimeter = 2 (length + width)[/tex]

but one side  length measures is not  required  because of the  river so

He does not use the fence along the side of the river

so we use this formula

Perimeter =  P = L + 2 b

Perimeter is 3000 m

[tex]so \ \ 3000 = l +2b[/tex]

[tex]l = 3000 - 2b[/tex]

 so area will be

[tex]A = (3000-2b)b[/tex]

 it  is a quadratic function whose max or min  will

occur at the average of the Solutions.  

 on Solving (3000 - 2b)b = 0  

  3000 - 2b = 0   or b=0

2b =3000

[tex]b =\frac{3000}{2} \\b = 1500 m[/tex]

or [tex]b = 0 m[/tex]

The average of the values are [tex]\frac{(0+1500)}{2} = 750[/tex]

so  for max area  we use b= [tex]750 m[/tex]

The Length is then L=3000 - 2(750) =  3000 - 1500 = 1500

 for max area

length = 1500 m

bredth = 750 m

area = 1500× 750 = [tex]1125000 m^2[/tex]

The largest area that can be enclosed by Farmer Ed with 3000 meters of fencing along a river (with only three sides fenced) equals 1,125,000 square meters by using principles of mathematical optimization.

In this question, Farmer Ed wants to maximize the area of a rectangle with only three sides fenced, since one side borders on a river. We can use the principles of optimization in mathematics to solve this problem.

With 3000 meters of fencing for three sides, if we denote one side perpendicular to the river as X and the side parallel to the river (which forms the base of the rectangle) as Y, then, the perimeter would be Y+2X which is equal to 3000 meters. So, Y = 3000-2X.

The area A of a rectangle is length times width, or, in this case, A = XY. Substituting Y from the equation above: A = X(3000-2X) = 3000X - 2X^2. To maximize this area, we need to find values of X for which this equation has its maximum value.

The maximum or minimum of a function can be found at points where its derivative is zero. So, we take the derivative of A with respect to X, set it equal to zero, and solve for X.

The derivative, dA/dX is 3000 - 4X. Setting this equal to 0 gives X = 3000/4 = 750. So, the maximum area that Farmer Ed can enclose is when X is 750, and Y is 3000 - 2X = 1500, so the maximum area is 750 * 1500 = 1,125,000 square meters.

https://brainly.com/question/32199704

#SPJ3

Answer:

7

Step-by-step explanation:

24/4=6.  7>6

The Minitab output from the t-test signifies that there is no statistically significant difference in the distances traveled by men and women at UF to get to class. The t-value and p-value obtained don't give enough evidence to reject the null hypothesis. The degrees of freedom (DF) indicate the number of independent observations in the sample.

The output from Minitab that you've shared is the result of a paired t-test comparing the mean distances traveled by men and women to get to class at UF. The null hypothesis in this context is that there is no difference in the average distances traveled by men and women (Difference = mu (F) - mu (M)). The t-value of -1.05 and the p-value of 0.305 do not provide enough evidence to reject the null hypothesis at the conventional 0.05 level of significance. Therefore, we could interpret the output as not detecting a statistically significant difference between the mean distances men and women travel to get to class at UF.

The 'DF' or degrees of freedom, indicates the number of independent observations in your sample that are free to vary once certain constraints (like the sample mean) are calculated. In this case, DF = 21, which is the sample size (pairs of men and women) minus 1.

https://brainly.com/question/35161872

#SPJ11

Answer:

48

Step-by-step explanation:

If only 4/5 of the 80 seats were filled, then 4/5*80=64 of the seats were filled. Of those filled, if 3/4 were travelling for business, then 3/4*64=48 of the people were travelling for business. Hope this helps!

Answer:

  no

Step-by-step explanation:

The angle in the polar form of a complex number can have any multiple of 2π radians added to it, and the number will be the same number. That is, there are an infinite number of representations of a complex number in polar form.

Final answer:

The polar form of a complex number is not unique due to the angle component, which can vary by multiples of full rotations (2π). However, when considering the principal value of the angle, the polar form becomes unique.

Explanation:

The polar form of a complex number is not entirely unique, the reason being that the angle (θ) in the polar form can be expressed as θ + 2πk, where k is any integer.

This is because complex numbers are represented in the complex plane, which is similar to a circle, where angles that differ by full rotations (2π radians) represent the same point.

However, the magnitude (or modulus) and the principal value of the angle (typically between -π and π) combine to give a unique representation of a complex number in polar form.

Answer:

1. the probability that giraffe will be shorter than 17 feet tall is equal to 0.1056

2. the probability that a randomly selected giraffe will be between 16 and 19 feet tall is equal to 0.8882

3. the the 90th percentile for the height of giraffes is 19.024

Step-by-step explanation:

To calculate the probability that a giraffe will be shorter than 17 feet tall, we need to standardize 17 feet as:

[tex]z=\frac{x-m}{s}[/tex]

Where x is the height of the adult giraffe, m is the mean and s is the standard deviation, so 17 feet is equivalent to:

[tex]z=\frac{17-18}{0.8}=-1.25[/tex]

Now, the probability that giraffe will be shorter than 17 feet tall is equal to P(z<-1.25). Then, using the standard normal distribution table, we get that:

[tex]P(z<-1.25)=0.1056[/tex]

At the same way, 16 and 19 feet tall are equivalent to:

[tex]z=\frac{16-18}{0.8}=-2.5\\z=\frac{19-18}{0.8}=1.25[/tex]

So, the probability that a randomly selected giraffe will be between 16 and 19 feet tall is equal to:

[tex]P(-2.5<z<1.25)=P(z<1.25)-P(z<-2.5)\\P(-2.5<z<1.25)=0.8944-0.0062\\P(-2.5<z<1.25)=0.8882[/tex]

Finally, to find the the 90th percentile for the height of giraffes, we need to find the value z that satisfy:

[tex]P(Z<z)=0.9[/tex]

Now, using the standard normal distribution table we get that z is equal to 1.28. Therefore, the height x of the giraffes that is equivalent to 1.28 is:

[tex]z=\frac{x-m}{s} \\1.28=\frac{x-18}{0.8} \\x=(1.28*0.8)+18\\x=19.024[/tex]

it means that the the 90th percentile for the height of giraffes is 19.024

Using Z-scores, the probability that a randomly selected giraffe is less than 17 feet tall is approximately 0.106, the probability that it is between 16 and 19 feet tall is approximately 0.888. The 90th percentile in height for giraffes is about 19.02 feet.

These questions are related to normal distribution. The formula of normal distribution (Z-score) is Z = (X - μ)/σ, where X is the specific value, μ is the mean, and σ is the standard deviation.

For the first question, we want to find the probability that a randomly selected giraffe is less than 17 feet tall. The Z-score is calculated as Z = (17 - 18) / 0.8 = -1.25. Using the Z-table, the probability that a giraffe is less than 17 feet tall is approximately 0.106.

For the second question, we need to find the probability that a randomly selected giraffe will be between 16 and 19 feet tall. We calculate two Z-scores: Z1 = (16 - 18) / 0.8 = -2.5 and Z2 = (19 - 18) / 0.8 = 1.25. Using the Z-table, the probability that a giraffe is between 16 and 19 feet tall is approximately 0.894-0.006 = 0.888.

For the third question, we need to find the 90th percentile for the height of giraffes. It corresponds to the Z-score of 1.282 on the Z-table. Hence, X = μ + Zσ = 18 + 1.282*0.8 = 19.02 feet.

https://brainly.com/question/30390016

#SPJ3

Answer:

0.67% probability he will have to shut down after this month

Step-by-step explanation:

In a Poisson distribution, the probability that X represents the number of successes of a random variable is given by the following formula:

[tex]P(X = x) = \frac{e^{-\mu}*\mu^{x}}{(x)!}[/tex]

In which

x is the number of sucesses

e = 2.71828 is the Euler number

[tex]\mu[/tex] is the mean in the given time interval.

On average sells 8.9 machines per month.

So [tex]\mu = 8.9[/tex]

Using the Poisson distribution, what is the probability he will have to shut down after this month

If he sells less than 3 machines.

[tex]P(X < 3) = P(X = 0) + P(X = 1) + P(X = 2)[/tex]

[tex]P(X = x) = \frac{e^{-\mu}*\mu^{x}}{(x)!}[/tex]

[tex]P(X = 0) = \frac{e^{-8.9}*8.9^{0}}{(0)!} = 0.0001[/tex]

[tex]P(X = 1) = \frac{e^{-8.9}*8.9^{1}}{(1)!} = 0.0012[/tex]

[tex]P(X = 2) = \frac{e^{-8.9}*8.9^{2}}{(2)!} = 0.0054[/tex]

[tex]P(X < 3) = P(X = 0) + P(X = 1) + P(X = 2) = 0.0001 + 0.0012 + 0.0054 = 0.0067[/tex]

0.67% probability he will have to shut down after this month

Answer: 7.3333

Step-by-step explanation:

Answer: 3 packets

12/2 = 6 seeds per packets

18/6 = 3 packets

Answer:

3

Step-by-step explanation:

If Jeanette grew 12 flowers with 2 seeds packets, that means that each seed packet grows 6 flower. 12/2=6

If each seed packet grows 6 flowers, 3 seed packets will give 18 flowers. Hope this helps!

This answer involves time series analysis concepts, specifically focusing on three-week moving averages and exponential smoothing methods. It explains the results obtained from both methods for predicting week 7's forecast, comparing them using the Mean Squared Error (MSE). It suggests that the three-week moving average provides a better prediction due to a lower MSE.

The question asked is a problem in time series analysis, a category of statistics that involves the use and interpretation of data points ordered in time. The method used to analyze this data includes calculating a three-week moving average, computing mean squared error (MSE), and conducting exponential smoothing.

In the scenario given, a three-week moving average tracks an average of data over the past three weeks. It showed a forecast for week 7 as 13.33 with an MSE value of 7.74. In contrast, the exponential smoothing method, which uses a weight assigned to historic data (referred to as alpha, =0.2 in this case) forecasted a higher value of 14.76 with a slightly greater MSE of 8.17.

Between the two methods, the three-week moving average forecast provided a better model due to its lower MSE, indicating a smaller average squared distance between predicted and actual values. Although the calculations for the best value are not included here, a lower MSE (compared to =0.2) was obtained with the value =0.157. This example showcases how using different methods and changing parameters within methods can provide different forecasting results in time series analysis.

https://brainly.com/question/34944828

#SPJ12

Answer:

0

Step-by-step explanation:

It is a horizontal line, the slope is 0 and it crosses the y-axis at 8

The line is a horizontal line, which has a slope that is equal to zero (0).

Given the following equation:

To calculate or determine the slope of the given line:

The slope of a line can be defined as the gradient of a line.

In Mathematics, a slope is typically used to describe both the direction and steepness of an equation of a straight line.  

Generally, the standard form of an equation of line is given by the following formula;

[tex]y = mx+b[/tex]

Where:

Comparing the two equations, we can deduce that the slope of the given line is equal to zero (0).

This ultimately implies that, the line is a horizontal line, which would cross the y-axis of a graph at point 8.

Read more: https://brainly.com/question/18123312

The expected value of the amount you would win from this game is $0.85 and the variance of the amount you win is $0.06.

To calculate the expected value, we need to multiply each outcome with its probability and sum them up. The outcomes and corresponding probabilities are as follows:

Then, the expected value is (8/9)*$1.10 + (1/9)*(-$1.00) = $0.96 - $0.11 = $0.85. So, (a) expected value of the amount you win is $0.85.

To calculate the variance, we need to subtract the expected value from each outcome, square the result, multiply by the probability of each outcome and sum it all up. Variance = (8/9)*($1.10-$0.85)^2 + (1/9)*(-$1.00-$0.85)^2 = $0.06. So, (b) the variance of the amount you win is $0.06.

https://brainly.com/question/31972753

#SPJ11

The expected value of the amount you win is approximately -$0.0667 and the variance of the amount you win is approximately $1.0888.

(a) To calculate the expected value of the amount you win, we first need to determine the probability of each outcome:

1. Probability of drawing two red marbles: [tex]\( P(\text{red-red}) = \frac{5}{10} \times \frac{4}{9} = \frac{20}{90} = \frac{2}{9} \)[/tex]

2. Probability of drawing two blue marbles: [tex]\( P(\text{blue-blue}) = \frac{5}{10} \times \frac{4}{9} = \frac{20}{90} = \frac{2}{9} \)[/tex]

3. Probability of drawing one red marble and one blue marble: [tex]\( P(\text{red-blue}) = 2 \times \frac{5}{10} \times \frac{5}{9} = \frac{50}{90} = \frac{5}{9} \)[/tex]

Now, let's calculate the expected value (\( E \)):

[tex]\[ E = (P(\text{red-red}) \times \$1.10) + (P(\text{blue-blue}) \times \$1.10) + (P(\text{red-blue}) \times -\$1.00) \]\[ E = \left(\frac{2}{9} \times \$1.10\right) + \left(\frac{2}{9} \times \$1.10\right) + \left(\frac{5}{9} \times -\$1.00\right) \]\[ E = \left(\frac{4}{9} \times \$1.10\right) + \left(\frac{5}{9} \times -\$1.00\right) \]\[ E = \$\left(\frac{4}{9} \times 1.10\right) + \$\left(\frac{5}{9} \times -1.00\right) \][/tex]

[tex]\[ E = \$\left(\frac{4.40}{9} - \frac{5.00}{9}\right) \]\[ E = \$\frac{-0.60}{9} \]\[ E = -\$0.0667 \][/tex]

So, the expected value of the amount you win is approximately -$0.0667.

(b) To calculate the variance of the amount you win, we'll use the formula for variance:

[tex]\[ \text{Var}(X) = E(X^2) - (E(X))^2 \][/tex]

We already know  E(X) from part (a). Now, let's calculate E(X)²:

[tex]\[ E(X^2) = (P(\text{red-red}) \times (\$1.10)^2) + (P(\text{blue-blue}) \times (\$1.10)^2) + (P(\text{red-blue}) \times (-\$1.00)^2) \]\[ E(X^2) = \left(\frac{2}{9} \times (\$1.10)^2\right) + \left(\frac{2}{9} \times (\$1.10)^2\right) + \left(\frac{5}{9} \times (-\$1.00)^2\right) \]\[ E(X^2) = \left(\frac{4}{9} \times (\$1.21)\right) + \left(\frac{5}{9} \times \$1.00\right) \]\[ E(X^2) = \$\left(\frac{4 \times 1.21}{9} + \frac{5}{9}\right) \][/tex]

[tex]\[ E(X^2) = \$\left(\frac{4.84}{9} + \frac{5}{9}\right) \]\[ E(X^2) = \$\frac{9.84}{9} \]\[ E(X^2) = \$1.0933 \][/tex]

Now, we can calculate the variance:

[tex]\[ \text{Var}(X) = E(X^2) - (E(X))^2 \]\[ \text{Var}(X) = \$1.0933 - (-\$0.0667)^2 \]\[ \text{Var}(X) = \$1.0933 - \$0.0045 \]\[ \text{Var}(X) = \$1.0888 \][/tex]

So, the variance of the amount you win is approximately $1.0888.

Therefore, the solution is (a) Expected value: -$0.0667 and (b) Variance: $1.0888