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(M/M/c) model - use the qtsPlus or other software to answer the questions. Now, you decided...

(M/M/c) model - use the qtsPlus or other software to answer the questions. Now, you decided to hire one more cashier, so the store has two cashiers. Customers arrive at the cashier counter according to a Poisson process, which is same as the question 1. The arrival rate is 18 customers per an hour. Customers are served in order of arrival (FCFS: first come first service). The service time (i.e. the time needed for scanning and paying) is exponentially distributed. The mean service time is 3 minutes for each cashier. A) Once you arrived at the cashier counter, on average, how many customers are waiting in the queue? B) Once you arrived at the cashier counter, on average, how long should you wait in the queue? C) Once you arrived at the cashier counter, on average, how long should it take to complete the service? D) What are the cashiers’ utilization rate?

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