The drive-thru window at Hokie Burger requires 2.5 minutes on average to process an order with a standard deviation of 3 minutes. Cars arrive at the window at a rate of 20 per hour.
a. On average, how many cars are waiting to be served?
b. On average, how long will a car spend in the service process?
c. Suppose Hokie Burger can install an automated drink-dispensing device that would reduce the standard deviation of the service time to 1 minute. How would your answers to the previous questions change?