Suppose that delivery cars arrive randomly at a restaurant with an exponentially distributed inter-arrival times with a mean of 0.1 hours. It is given that it takes a restaurant employee 4 minutes -...

Extracted text: Suppose that delivery cars arrive randomly at a restaurant with an exponentially distributed inter-arrival times with a mean of 0.1 hours. It is given that it takes a restaurant employee 4 minutes - on average to prepare the order with a standard deviation of 2 minutes Spe that delivery drivers are paid $10 per hour. Calculate the average cost per hour of driverS waiting for their orders to be prepared. Select one: O A. 8.33 O B. 8.25 O C. 12.50 O D. None O E. 8 Next page