### Poisson and exponential distributions appear to be relevant

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Calls arrive at Lynn Fish's hotel switchboard at the rate of 2 per minute. The average time to handle each is 20 seconds. There is only one operator at the current time. The Poisson and exponential distributions appear to be relevant in this situation.

a. What is the probability that the operator is busy?

b. What is the average time that a customer must wait before reaching the operator?

c. What are the average numbers of calls waiting to be answered?

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