Question 17 (4 points) Interstate buses are required to go through a safety inspection center. Buses arrive at the center at the average rate of 80 an hour and the average service rate is 20 buses per hour per inspector. Currently there are five inspectors on duty. How many minutes, on average, would a bus that is not immediately checked have to wait? 2.662 minutes (approximately 0.0443 hour) 1.662 minutes (0.0277 hour) 14.662 minutes (approximately 0.0777hour) 3 minutes (0.05 hour) Question 18 (3 points) Given the following data: Cycle time = 2.5 minutes Station 1 2 3 Station time (min) 2.1 2.3 2.2 2.4 4. The efficiency of this process is 88% 84% 10% 90% m 10% 90% Question 19 (4 points) The Medical Aid Supply Co. purchases (orders) gauze in lots of 3000 boxes, i.e. Q=3000. This is equal to their six-month demand. The ordering cost is $20 per order, and the holding cost per unit per year is estimated to be $4.50. Management also maintains a safety stock that is equal to one month's use (already in stock). What is the total annual cost for ordering and holding inventory under the current policy? $6,790 S2.290 $9.000 $9,040 Question 20 (2 points)