how do I calculate average flow time correctly?

Currently a company that designs Web sites has five customers in its backlog. The time since the order arrived, processing time, and promised due dates are given in the following table. The customers are ready to be scheduled today, which is the start of day 190. Q Time Since Order Arrived (days ago) 2 Due Date (days from Processing Time (days) Customer now) 32 100 A B 10 20 26 8 26 50 D 6 28 66 E 3 30 58 a. Develop separate schedules by using the FCFS and EDD rules. Compare the schedules on the basis of average flow time and average days past due. Using the FCFS (first come, first served) decision rule for sequencing the customers, the order is: 2 3 4 5 Sequence Customer 1 B C D E A Using the EDD (earliest due date) decision rule for sequencing the customers, the order is (to resolve a tie, use the order in which the jobs were received): 1 2 3 4 5 Sequence Customer B E The average flow time and average days past due for each option are: (Enter your responses rounded to one decimal place.) Rule Average Flow Time 82.2 EDD FCFS 81.8 D A Average Days Past Due 18.4 18.0