Assume that for the model in example problem 1 the analyst determines that neither the inter-arrival times nor the service times are exponential. From the data, she calculates the following:
mean time between arrivals = 20 minutes
standard deviation for arrivals = 10 minutes
mean service time = 15 minutes
standard deviation for service time = 5 minutes
Determine the expected waiting time for the customers and the average number of customers in the waiting room for this queuing system.