Question 4 Find the variance of X, where X takes the value 28, 46, 73, 73 with equal probability.

In your own words, describe what the difference is between an error term and a residual. How does sample size affect the variance of each?

A small retail store has customers whose ages are normally distributed, with a mean of 37.5 and a standard deviation of 7.6. What is the probability that a randomly selected customer is younger than 25 years old? Round your answer to three decimal places, e.g. 0.685.

this population, and the mean of each sample is determined. The mean, ux,is The standard error of the mean, Oy, is (Round your answer to 2 decimal places). QUESTION 4 The average number of miles driven each day by a group of drivers is 20.7 miles with a standard deviation of 6.5 miles. If you randomly select 50 drivers, what is the probability that the average number of miles driven each day is between 19.4 and 22.5 miles? Round your answer to 4 decimal places. Click Save and Submit to save and submit. Click Save All Answers to save all answers. Save All Answers 5,337 MAY 24 MacBook Air B口 F3 888 F2 F4 1880 %23 24 4 3 T

7. The amount spent by a customer on a Summer Cruise has a normal distribution with a mean of $95.60 and a standard deviation of $5. a) Calculate the probability that a randomly selected customer spends less than $95. b) The probability that customers spend more than x dollars is 0.2810. Find the value of r.

Using the normal distribution table find ZO such that: P(Zs- Zo) = .0132 1.96 -1.64 -2.22 2.17