1 Staffing with the M/M/s Queue McNeese is determining the staffing level for their credit union located within the university, and has recently hired two tellers (servers). The beginning of the fall semester is their busiest time, with incoming freshmen and transfer students opening accounts. On average, it takes a teller E [T] = 10 minutes to successfully open an account (equivalent to a / = 6 per hour) and the average arrival rate has been A = 6 per hour. As always, we use the exponential distribution as a reasonable approximation for both the interarrival and service times. After meeting with McNeese's upper- administration, the manager of the credit union is considering two possible scenarios for the service layout: . Scenario 1: two M/M/1 (dedicated) queues that each serve >/2 arrivals . Scenario 2: one M/M/2 (pooled) queue that serves all > arrivals A queuing analysis was conducted on each scenario, and the results are as follows: Scenario 1 Scenario 2 Utilization factor p = 0.50 p = 0.50 Mean number in the queue E [L,] = 0.50 customers E[L,] = 0.37 customers For Scenario 1, what is the average time in line (minutes) for a customer, E [W,]? (Hint: remember to use the correct arrival rate detailed in the first bullet point above.) O a. 10 minutes O b. 8.7 minutes O c. 20 minutes O d. 5 minutes Clear my choice For Scenario 1, what is the average time (minutes) spent in the system, E [W]? (Hint: as always, remember to first derive the mean number in the system E [Z].) O a. 5 minutes O b. 20 minutes c. 10 minutes d. 8.7 minutes