At Morgan's Transformer Rebuilding, a set of five jobs is ready for dispatching to a machine center. The processing times and due dates for the jobs are given in the table below
Use shortest processing time to sequence the jobs, and calculate the average completion time, the average job lateness, and the average number of jobs in the machine center.
Job Work Time (days) Due Date (days)
A 15 38
B 13 28
C 7 20
D 18 50
E 9 15
The optimal sequence is C-E-B-A-D. The average completion time is 31.6 days. The average lateness is 4 days. The average jobs in system is 2.548. Details appear in the table below.
SPT Time Due Date Slack Flow time Late days
C 7 20 13 7 0
E 9 15 6 16 1
B 13 28 15 29 1
A 15 38 23 44 6
D 18 50 32 62 12
Total 158 20
Average 31.6 4
Average number of jobs in system: 2.548
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