Reconsider Prob. 22.8-4.

For the single-server queueing system under consideration, suppose now that service times definitely have an exponential distribution. However, it now is possible to reduce the variability of interarrival times, so we want to explore the impact of doing so.

Assume now that  1 and 1.25, so  0.8. Let 2 now denote the variance of interarrival times.

Follow the instructions of Prob. 22.8-4a, where the distributions for the three cases now are for interarrival times instead of service times.