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Arrivals at a fast-food restaurant follow a Poisson distribution with a mean arrival rate of 5 customers per hour. (a) What is the probability that

Arrivals at a fast-food restaurant follow a Poisson distribution with a mean arrival rate of 5 customers per hour.

(a) What is the probability that in the next hour there will be exactly 7 arrivals?

(b) What is the probability that in the next hour there will be exactly 2 arrivals?

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