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The average price of a college math textbook is $154 and the standard deviation is $23. Suppose
that 9 textbooks are randomly chosen. Round all answers to 4 decimal places where possible.
a. What is the distribution of ? N
~
b. For the group of 9, find the probability that the average price is between $151 and $159.
c. Find the first quartile for the average textbook price for this sample size. $
(Round to the nearest cent)
d. For part b), is the assumption that the distribution is normal necessary? O Yes or No

Sagot :

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