Of all the Harry Potter books purchased in a recent year, about 60% were purchased for readers

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Of all the Harry Potter books purchased in a recent year, about 60% were purchased for readers 14 or older. If 12 Harry Potter fans who bought books that year are surveyed and if p = .6, find the following probabilities.

Who's Reading Harry Potter? Under 14 14 and 41% older 59%


a. At least five of them are 14 or older.

b. Exactly nine of them are 14 or older.

c. Less than three of them are 14 or older.

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Introduction To Probability And Statistics

ISBN: 9780495389538

13th Edition

Authors: William Mendenhall, Robert J. Beaver, Barbara M. Beaver

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