16-18

16. A server operates with 70% utilization. The coefficient of variation for the service process is 0.6 and the coefficient of variation of the arrival process is 1. The average processing time is 3 minutes. What is the average time a customer spends in the system according to the single-server queue model? A. 9 minutes B. 6 minutes C. 3 minutes D. 7.5 minutes 17. Consider an Erlang loss system. The average processing time is 6 minutes. The average interarrival time is 3 minutes. The number of servers is 9 . What is the capacity of the system? A. 0.8 customers per minute B. 1.5 customers per minute C. 1.1 customers per minute D. 2.4 customers per minute 18. CQA's potato chip filling process has a lower specification limit of 10.5oz. and an upper specification limit of 11.5 oz. The standard deviation is 0.15 oz. and the mean is 11 oz. What is the process capability index for the chip filling process? A. 1.77 B. 0.56 C. 3.33 D. 1.11