Consider a four-step serial process with the number of workers at each step and processing times given in the following table. Process Step Number of Workers Time per Customer (in Minutes) 1 1 2 3 4 5 3 5 15 10 3 1 Assuming that the process starts out empty and is worker-paced, how long will it take (in minutes) to serve 20 customers? minutes to serve 20 customers A campus deli serves 275 customers over its busy lunch period from 11:30 a.m. to 1:30 p.m. A quick count of the number of customers waiting in line and being served by the sandwich makers shows that an average of 9 customers are in process at any point in time. What is the average amount of time that a customer spends in process? Instructions: Round your final answer to 1 decimal place. Average amount of time minutes