The number of customers who arrive at a fast food business during a one-hour period is known to be Poisson distributed with a mean equal to 8.60. The probability that between 2 and 3 customers inclusively will arrive in one hour is 0.0263.

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The probability of exactly 2 customers arriving is 0.0132, and the probability of exactly 3 customers arriving is 0.0131. The probability of between 2 and 3 customers arriving is the sum of these two probabilities, which is 0.0263.

The Number of Customers Who Arrive at a Fast Food