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Five jobs are ready for processing at time zero through a workstation. The details of the...

Five jobs are ready for processing at time zero through a workstation. The details of the processing time and the due date of completion is provided in the following table.

Job Processing Time (days) Due Date

A 8 12

B 4 9

C 3 6

D 7 7

E 5 20

Using the shortest processing time (SPT) rule, it can be concluded that the average flow time for these five jobs is _____.

a. more than 14 but less than or equal to 16 days.

b. more than 8 but less than or equal to 10 days.

c. more than 10 but less than or equal to 12 days.

d. more than 12 but less than or equal to 14 days.

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Answer #1

Option d. Avg flow time is 13.6 days.

Calculation is given below:

Arrange small to large SPT Processin Due Date Flow time (days) Job Time (8 (cumu Tardines s Wait Time 20 19 27 68 13.6 15 27 5.4 19 41 8.2 Total Average

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