The Friendly Neighbor Grocery Store has a single check out stand with afull-time cashier.Customers arrive randomly at the stand at a mean rate of 30 per hour.The service-time distribution is exponential, with a mean of 1.5 minutes.This situation has resulted in occasional long lines and complaints fromcustomers.Therefore, because there is no room for a second checkout stand, themanager is considering the alternative of hiring another person to help thecashier by bagging the groceries.This help would reduce the expected time required to process a customer to1 minute, but the distribution still would be exponential.The manager would like to have the percentage of time that there are morethan two customers at the checkout stand down below 25 percent.She also would like to have no more than 5 percent of the customers needingto wait at least five minutes before beginning service, or at least sevenminutes before finishing service.