For a Single-Line, Multi-Server, Single-Phase Waiting Line System, Where

Multiple Choice

For a single-line, multi-server, single-phase waiting line system, where  represents the mean arrival rate of customers and  represents the mean service rate for each of s identical servers, what is the formula for the average utilization of the system?

A)  / 
B)  / ()
C)  / s
D) s / ()
E)  / s()