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QUESTION 5 Suppose three ATMs are outside a bank, and customers arrive following a Poisson process with an average interarrival time of 2.5 minutes. Each

QUESTION 5

Suppose three ATMs are outside a bank, and customers arrive following a Poisson process with an average interarrival time of 2.5 minutes. Each ATM takes, on average, 4.5 minutes to serve a customer, and the processing time follows an exponential distribution. What is the average wait time for a customer to use an ATM?

0.82

1.47

4.85

2.91

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