Question: 12. Consider the queueing system for the walk-in services of a clinic. The average time between two consecutive arrivals is 3 minutes. Customers join a

12. Consider the queueing system for the walk-in services of a clinic. The average time between two consecutive arrivals is 3 minutes. Customers join a single queue and get served by one of 3 available servers. A server can serve 7 customers per hour on the average. The customers get served first-come-first-served (FCFS). What is the average number of customers waiting in the queue at any point in time? Mark the nearest answer.

  1. 1

  2. 18

  3. 21

  4. 30

  5. 2

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