A multiple-server queueing system with an exponential arrival rate and service time has a mean arrival rate of 4 customers per hour and a mean service time of 18 minutes per customer. The minimum number of servers required to keep the utilization factor under 1 is:
A) 1.
B) 2.
C) 3.
D) 4.
E) 5.

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The Answer of A multiple-server queueing system with an exponential arrival rate and service time has a mean arrival rate of 4 customers per hour and a mean service time of 18 minutes per customer. The minimum number of servers required to keep the utilization factor under 1 is:
A) 1.
B) 2.
C) 3.
D) 4.
E) 5.

A Multiple-Server Queueing System with an Exponential Arrival Rate and Service