For a Single Server, Single Queue System with an Arrival

Multiple Choice

For a single server, single queue system with an arrival rate of 12 customers per hour and a service rate of 20 customers per hour, what is the mean waiting time in the system (to two decimal places) ?

A) 0.90 hours
B) 0.08 hours
C) 0.13 hours
D) Cannot be determined from the information given