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Question

Four jobs are to be processed on a machine as per data listed in the table.

Job Processing time (in days) Due date
1 4 6
2 7 9
3 2 19
4 8 17

If the Earliest Due Date (EDD) rule is used to sequence the jobs, the number of jobs delayed is

A
4
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B
1
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C
3
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D
2
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Solution

The correct option is C 3
Sequence by Earliest Due Date (EDD)
Job Time Job flow time Due date Delay / Days or tardiness
1 4 0 + 4 = 4 6 +2
2 7 4 + 7 = 11 9 -2
4 8 11 + 8 = 19 17 -2
3 2 19 + 2 = 2 19 -2

No. of delay = 3

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