# Question: The number of telephone calls that arrive

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?

(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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