Question: A bank knows the average customer interarrival time is 4 minutes. The average processing time of a clerk is 15 minutes. Assume that the service

  1. A bank knows the average customer interarrival time is 4 minutes. The average processing time of a clerk is 15 minutes. Assume that the service system of the bank has Poisson arrivals and exponential service time. If the manager aims to control the average customer waiting time within 5 minutes, what is the minimum number of clerks the bank should hire?

A. 5

B. 6

C. 8

D. 7

*INCLUDE SOLUTIONS PLEASE, THANK YOU.

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