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The number of service calls in a day to an appliance store follows a Poisson distribution with a mean of 4. (a) Calculate the probability

The number of service calls in a day to an appliance store follows a Poisson distribution with a mean of 4.

(a) Calculate the probability that there are exactly 5 service calls in a given day.

b) Calculate the probability that there are at least two service calls in a given day.

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