# Question

Customer arrivals at a bank are random and independent; the probability of an arrival in any one-minute period is the same as the probability of an arrival in any other one-minute period. Answer the following questions, assuming a mean arrival rate of three customers per minute.

a. What is the probability of exactly three arrivals in a one-minute period?

b. What is the probability of at least three arrivals in a one-minute period?

a. What is the probability of exactly three arrivals in a one-minute period?

b. What is the probability of at least three arrivals in a one-minute period?

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