1. In a 3 server queue, if the queue has 2 persons waiting for service, the number in the systems is________

9

5

3

2

6

2.

In a 3 server queue, if the arrival rate is 2 customers per minute, the average time between two arrivals (also called inter-arrival time) to the queue is ________

10 seconds

6 minutes

30 seconds

2 minutes

3.

In a 3 server queue, the customers arrive at the rate of 2 per minute, the service time should be less than ________ minutes for the queue to be stable (that means utilization<1)

2 minutes

3 minutes

2 per minute

1.5 per minute

1.5 minutes