The data provided in the question:-
Job |
Processing time |
Due Date |
A |
12 |
Nov 30 |
B |
15 |
Dec 22 |
C |
3 |
Nov 18 |
D |
8 |
Dec 3 |
E |
6 |
Nov 29 |
Answer a:-
i:- Shortest processing time:- In order to find out the sequence as per this rule, the job which has the least processing time will be sequenced first and then the remaining jobs will be sequenced in the increasing processing time.
So the job sequence will be as below:-
C-E-D-A-B
ii:- Earliest due date:- In this, the job which has the least due date will be sequenced first followed by the jobs having later due dates.
So the sequence will be:-
C-E-A-D-B
iii:- Longest processing time:- In order to find out the sequence as per this rule, the job which has the maximum processing time will be sequenced first and then the remaining jobs will be sequenced in the decreasing processing time.
So the job sequence will be as below:-
B-A-D-E-C
Answer b:- For Shortest processing time:-
Jobs |
Flow in Time |
Flow Out time |
C |
0 |
0+3=3 |
E |
3 |
3+6=9 |
D |
9 |
9+8=17 |
A |
17 |
17+12=29 |
B |
29 |
29+15=44 |
Total Flow time = 3+9+17+29+44=102
Average completion time = Total flow time / number of jobs
Average completion time =102/5
Average completion time =20.4 Days
For Earliest Due Date:-
Jobs |
Flow in Time |
Flow Out time |
C |
0 |
0+3=3 |
E |
3 |
3+6=9 |
A |
9 |
9+12=21 |
D |
21 |
21+8=29 |
B |
29 |
29+15=44 |
Total Flow time = 3+9+21+29+44=106
Average completion time = Total flow time / number of jobs
Average completion time =106/5
Average completion time =21.2 Days
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