A single machine work center has five jobs assigned to it. They are labeled, in
ID: 403422 • Letter: A
Question
A single machine work center has five jobs assigned to it. They are labeled, in the order of their arrival in the shop, as jobs A, B, C, D and E. The work center may work on only one job at a time and must complete any job it starts before starting another job. Job A has a processing time of 6 days and is due to the customer in 9 days. Job B has a processing time of 2 days and is due in 16 days. Job C has a processing time of 4 days and is due in 10 days. Job D has a processing time of 3 days and is due in 7 days. Job E has a processing time of 5 days and is due in 12 days. Using the shortest (earliest) due date rule, what is the average completion (flow) time of all jobs?
A) 4.0
B) 12.6
C) 2.6
Explanation / Answer
Slack time for each activity = Due date time - time for processing the work
On the basis of slack time remaining , activities are sequenced as follows.
lateness for each activity is calculate as a difference of time to complete the activity and due date of that activity.
Average lateness = Total lateness / no. of activities = 15/5 = 3 days
Jobs Processing Time (days) Due Date Time (days) Slack time Remaining A 6 9 3 B 2 16 14 C 4 10 6 D 3 7 4 E 5 12 7Related Questions
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