The average price of a college math textbook is $167 and the standard deviation is $21. Suppose that 9 textbooks are randomly chosen. Round all answers to 4 decimal places where possible. a. What is...

Extracted text: The average price of a college math textbook is $167 and the standard deviation is $21. Suppose that 9 textbooks are randomly chosen. Round all answers to 4 decimal places where possible. a. What is the distribution of ? I N( b. For the group of 9, find the probability that the average price is between $160 and $164. c. Find the third quartile for the average textbook price for this sample size. S (round to the nearest cent) d. For part b), is the assumption that the distribution is normal necessary? Yes No