Stephanie Wonders Whether College Textbooks Change in Price as Students

Multiple Choice

Stephanie wonders whether college textbooks change in price as students advance in their academic work.She finds some national data on college textbooks that indicates the average price of a text is $96 with a standard deviation of $31.She decides to collect the prices of 30 textbooks that are required for senior-level courses at her university.She finds the average cost to be $89.What is the percentile rank of Stephanie's collection of books? (Round z score to two decimal places.)

A) 8.71
B) 10.75
C) 39.25
D) 41.29