Solution-The number of calls received by a phone operator

The number of calls received by a phone operator at an emergency department between 10-11am has a Poisson distribution with a mean of 12.

(a) Find the probability that the operator received at least 5 calls during the following period.

I. 10-11am
II. 10-10.30am
III. 10-10.15am

(b) What is the probability that fever than 4 calls were received between 10 & 10.30am?

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