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5. Phone calls arrive at a switchboard at an average rate of A = 2 per minute. Assume that the number of calls in a

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5. Phone calls arrive at a switchboard at an average rate of A = 2 per minute. Assume that the number of calls in a minute follows the Poisson distribution with parameter 1. (a) What is the probability that exactly two calls arrive in a minute? (b) Find the probability that more than two calls arrive in a minute

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