Managing Operations Across the Supply Chain 1st Edition by Morgan Swink,Steven Melnyk,Bixby Cooper, Janet Hartley

Exercise 26

You have been asked to determine the average wait time for a process that has been the management of your company problems.From data you collected over a two week period (which you feel are representative), you have determined the following:
Average process utilization: 80 percent
Average processing time: 10 minutes
Average job arrival rate: 10 minutes
Processing time, standard deviation: 50 minutes
Arrival rates, standard deviation: 100 minutes
a.What is the average wait time?
b.If management wants to promise its customers an average wait time in the system of no more than 24 hours, what recommendations would you provide management on how to change the operation of the process of concern?