A boy mentions that none of the 21 kids in his third-grade class has had a birthday

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A boy mentions that none of the 21 kids in his third-grade class has had a birthday since school started 56 days previously. Assume that kids in the class are drawn from a population whose birthdays have the same probability on all days of the year. What is the probability that 21 kids in such a class would not yet have a birthday in 56 days?

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The Analysis Of Biological Data

ISBN: 9781319226237

3rd Edition

Authors: Michael C. Whitlock, Dolph Schluter

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