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A brilliant young golfer wins 15% of the tournaments she enters. We will assume the results...

A brilliant young golfer wins 15% of the tournaments she enters. We will assume the results of each tournament are independent of other tournaments. a) If she enters 20 tournaments this year, what is the probability she will win none of them? b) What is the expected value of the number of tournaments she must enter in order to win her first tournament? What is the variance of that number?

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