Women's shoe sizes are (approximately) normally distributed, with an average size of 8.076 and a standard deviation of 1.468. You work at Vogue Magazine, and would like to interview some women about how shoes fit. You take a random sample of 10 women. What is the probability that the 10 women you sampled had an average shoe size that is less than 7.5?

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Refer to the accompanying table, which describes results from groups of 8 births from 8 different sets of parents. The random variable x represents the number of girls among 8 children. Find the mean and standard deviation for the number of girls in 8 births. Click the icon to view the data table. The mean is μ = girl(s). (Round to one decimal place as needed.) The standard deviation is o = girl(s). (Round to one decimal place as needed.) Table of numbers of girls and probabilities Number of Girls x 8678 A WN 10 2 3 4 5 Print P(x) 0.003 0.032 0.114 0.227 0.266 0.214 0.112 0.029 0.003 Done - X 35 Next

Salaries for teachers in a particular elementary school district are normally distributed with a mean of $45,000 and a standard deviation of $6,200. We randomly survey ten teachers from that district. Find the 80th percentile for the sum of ten teachers' salary. (Round your answer to the nearest whole number.)

Suppose that we know that 33.8% of the people born in the United States between 1936 and 1951 have BLUE eyes.  Three randomly selected Americans are selected and examined for eye color. If you let success correspond to an American having BLUE eyes, calculate the following. Calculate the standard deviation.

QUESTION 8 According to BusinessWeek, 44% of advertisers claim they have been a victim of internet click fraud. If 120 advertisers are survey more of them will claim they have been a victim of internet click fraud, a. None of the answers is correct Ob.0.8310 OC. 0.6293 d. 0.3707 e.0.1690 QUESTION 9 Assume the cost for an automobile repair is normally distributed with a mean of $524 and a standard deviation of $149. If the cost lower 7% of automobile repair charges, what is your cost? Click Save and Submit to save and submit. Click Save All Answers to save all answers. MacBook Air 20 F3 D00 F4 F2 F5 $ & 1 4 Q W R T Y #

Solve the problem.Assume that mountain lions' weights are normally distributed with a mean of 62.6 kilograms and a standard deviation of 2.6 kilograms. If 70 mountain lions are randomly selected, find the probability that they have a mean weight between 61.9 kilograms and 62.8 pounds.

The average person uses 130 gallons of water daily. If the standard deviation is 35 gallons , find the probability that the mean of a randomly selected sample of 25 people will be between 110 and 135 gallons.Assume the variable is normally distrubuted

The electric bills for all households in a large city have the normal distribution with a mean of $68 per month and a standard deviation of $10. Find the probability that an electric bill is greater than $70.

A normal population has a mean of $95 and standard deviation of $14. You select random samples of 50. what is the standard error of the sampling distribution of sample means?