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Statement of a problem № m1115

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The number of telephone calls that arrive at a exchange is often modeled as a Poisson random variable. Assume that on the average there are 10 calls per hour. (a) What is the probability that there are exactly 5 calls hour? (b) What is the probability that there are 3 or less calls hour? (c) What is the probability that there are exactly 15 two hours? (d) What is the probability that there are exactly 530 minutes?

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