Suppose that personality textbooks have an average of 325 pa

Suppose that personality textbooks have an average of 325 pages, with a standard deviation of 20 pages. If the number of pages is normally distributed, what proportion of personality textbooks will have more than 335 pages? ________ Suppose further that 225 professors who teach personality each own 16 personality textbooks; assume that the books can be considered a random sample of all personality textbooks. Each professor records the number of pages in her or his books and then computes the mean of those 16 books. What percentage of professors have mean number of pages greater than 335?

ANSWER: 31% ; 2%

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Solution