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4. Suppose that customers arrive at a bank according to a P P(λ) with λ =...

4. Suppose that customers arrive at a bank according to a P P(λ) with λ = 12 per hour. Compute the following: (a) The mean and variance of the customers who enter the bank during 5 hours. (b) Probability that more than 5 customers enter the bank during an hour. (c) Probability that exactly 1 arrival between 9:00am and 11:00am and exactly 2 arrivals between 10:00am and 12:00 noon.

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