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Customers arrive at Crusty's Pizza at an average rate of 25 per hour. Assume Poisson distribution applies. What is the probability of more than 21

Customers arrive at Crusty's Pizza at an average rate of 25 per hour. Assume Poisson distribution applies.

What is the probability of more than 21 customers arriving in one hour?

a. 0.25

b. 0.75

c. 0.71

d. 0.2

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