suppose you are waiting in line to check out at a grocery store and there are 7 other customers in front of you (so you are customer 8) by inspecting the amount of items in their baskets you estimate the following check-out time in minutes: customer 1: 10 minutes Customer 2: 5 minutes Customer 3: 3 minutes Customer 4: 7 minutes Customer 5: 5 minutes Customer 6: 10 minutes Customer 7: 2 minutes Customer 8: 5 minutes. What would be the scheduling model for this situation (environment, restriction, constraints) if you wish to minimize the total time in system? use the appropriate scheduling notation