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# Every day Jo practices her tennis serve by continually serving 100 times

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Every day Jo practices her tennis serve by continually serving 100 times. Suppose each of her is, independently of previous ones, successful with probability 0.4. Let the random variable X be the serves number of successful serves.

1. What is the probability that Jo has exactly 50 successful serves?

2. What is the probability that Jo has between 35 to 45 successful serves?

3. What is the probability that Jo has at least 30 successful serves?

4. What is the expected number of successful serves

5. What is the median number of successful serves i? That is, P(X

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## [Solved] Every day Jo practices her tennis serve by continually serving 100 times

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