Question: East Lansing post office has 7 tellers from Monday through Saturday. Customers arrival is a Poisson process, and the arrival rate is 36 customers per

East Lansing post office has 7 tellers from Monday through Saturday. Customers arrival is a Poisson process, and the arrival rate is 36 customers per hour. The service time is exponentially distributed with mean 10 minutes. What is the average number of customers waiting in line?

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