The jobs listed below need to be completed.Assume that it is now day 140.If the jobs are sequenced according to the shortest processing time rule,what is the average completion time?
A)47.6 days
B)60.2 days
C)94.0 days
D)2.5 days
E)238.0 days

Question

The jobs listed below need to be completed.Assume that it is now day 140.If the jobs are sequenced according to the shortest processing time rule,what is the average completion time? 
A)47.6 days 
B)60.2 days 
C)94.0 days 
D)2.5 days 
E)238.0 days

Quizplus · Accepted Answer

By sequencing the jobs according to the shortest processing time rule, we get the following schedule:

Job 4, Job 1, Job 2, Job 3, Job 5

The completion times for each job are:
- Job 4: 1 day (finishes on day 141)
- Job 1: 3 days (finishes on day 143)
- Job 2: 5 days (finishes on day 145)
- Job 3: 10 days (finishes on day 150)
- Job 5: 120 days (finishes on day 260)

The average completion time is then calculated as (1+3+5+10+120)/5 = 47.6 days, which corresponds to answer choice A.

The Jobs Listed Below Need to Be Completed