(d) Among all possible service-timé disiou fixed), the exponential distribution yields the largest value of 17.7-4....
Problem 4. Marsha operates an expresso stand. Customers arrive according to a Poisson process at a mean rate of 30 per hour. The time needed by Marsha to serve a customer has an exponential distribution with a mean of 90 seconds (a) Find L, Lq, W, and W (b) Suppose Marsha is replaced by an expresso vending machine that requires exactly 75 seconds for each customer to operate. Find L, Lq, W, and W Problem 4. Marsha operates an expresso...