You are the manager of a restaurant for a fast-food franchise.

1.    You are the manager of a restaurant for a​ fast-food franchise. Last​ month, the mean waiting time at the​ drive-through window for branches in your geographical​ region, as measured from the time a customer places an order until the time the customer receives the​ order, was 3.8 minutes. You select a random sample of 64 orders. The sample mean waiting time is 3.54 minutes, with a sample standard deviation of 0.8 minute. Complete parts​ (a) and​ (b) below.