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please answer just need the answer 7. Assume that the arrival of airplanes at a one-runway airport is a Poisson distribution with a mean rate

please answer just need the answer

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7. Assume that the arrival of airplanes at a one-runway airport is a Poisson distribution with a mean rate of = 8 planes per hour. The landing time is an exponential distribution with a mean of 5 minutes per plane. What is the mean number of planes in a holding pattern? C A. 1 C B. 1.33 C C. 1.67 C D. 2

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