PLEASE SHOW WORK SO I CAN FOLLOW ALONG--THANKS! The following table contains inf
ID: 450969 • Letter: P
Question
PLEASE SHOW WORK SO I CAN FOLLOW ALONG--THANKS!
The following table contains information regarding jobs that are to be scheduled through one machine:
OPERATIONS TIME
JOB
PROCESSING TIME(DAYS)
DUE DATE
A
4
20
B
12
30
C
2
15
D
11
16
E
10
18
F
3
5
G
6
9
1.) What is the shortest operating time (SOT) schedule (sequence)?
2.) What is the slack time remaining (STR) schedule (sequence)?
3.) For the schedule (sequence) F-G-C-D-E-A-B, compute mean flow time?
OPERATIONS TIME
JOB
PROCESSING TIME(DAYS)
DUE DATE
A
4
20
B
12
30
C
2
15
D
11
16
E
10
18
F
3
5
G
6
9
Explanation / Answer
Answer: OPERATIONS TIME JOB PROCESSING TIME(DAYS) DUE DATE Slack Time Critical Ratio A 4 20 16 5 B 12 30 18 2.5 C 2 15 13 7.5 D 11 16 5 1.454545 E 10 18 8 1.8 F 3 5 2 1.666667 G 6 9 3 1.5 Slack Time Remaining (STR) = time remaining before due date - remaining processing time Critical Ratio (CR) = Time remaining before due date/Remaining processing time Shortest Processing Time Schedule JOB PROCESSING TIME(DAYS) DUE DATE Flow time C 2 15 2 F 3 5 5 A 4 20 9 G 6 9 15 E 10 18 25 D 11 16 36 B 12 30 48 Slack Time Remaining Schedule JOB PROCESSING TIME(DAYS) DUE DATE Slack Time F 3 5 2 G 6 9 3 D 11 16 5 E 10 18 8 C 2 15 13 A 4 20 16 B 12 30 18 JOB PROCESSING TIME(DAYS) DUE DATE Flow Time F 3 5 3 G 6 9 9 C 2 15 11 D 11 16 22 E 10 18 32 A 4 20 36 B 12 30 48 Mean Flow time = 48/7 = 6.85714286
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