Stephanie Wonders Whether College Textbooks Change in Price as Students

question 5

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

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