105. Disregarding the possibility of a February 29 birthday, suppose a randomly selected individual is equally likely...
Question:
105. Disregarding the possibility of a February 29 birthday, suppose a randomly selected individual is equally likely to have been born on any one of the other 365 days.
a. If ten people are randomly selected, what is the probability that all have different birthdays? That at least two have the same birthday?
b. With k replacing ten in part (a), what is the smallest k for which there is at least a 50–50 chance that two or more people will have the same birthday?
c. If ten people are randomly selected, what is the probability that either at least two have the same birthday or at least two have the same last three digits of their Social Security numbers? [Note: The article “Methods for Studying Coincidences” (F. Mosteller and P.
Diaconis, J. Amer. Stat. Assoc., 1989: 853–861) discusses problems of this type.]
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