A Multiple-Server System Has Customers Arriving at an Average Rate

Multiple Choice

A multiple-server system has customers arriving at an average rate of five per hour and an average service time of forty minutes.The minimum number of servers for this system to have a utilization factor under 1 is:

A) 2.
B) 3.
C) 4.
D) 5.
E) None of the above.
Customers arrive at a suburban ticket outlet at the rate of 14 per hour on Monday mornings (exponential interarrival times) .Selling the tickets and providing general information takes an average of 3 minutes per customer,and varies exponentially.There is 1 ticket agent on duty on Mondays.