If the following jobs are sequenced according to the first-come-first-served (FCFS)rule then the mean completion time in days for all jobs is (assume zero for today's date)
A)33 days.
B)22 days.
C)6.6 days.
D)4.4 days.

Question

If the following jobs are sequenced according to the first-come-first-served (FCFS)rule then the mean completion time in days for all jobs is (assume zero for today's date) 
A)33 days. 
B)22 days. 
C)6.6 days. 
D)4.4 days.

Quizplus · Accepted Answer

To calculate the mean completion time using FCFS, we need to sum up the time taken to complete each job, and then divide by the number of jobs.

Job A: Starts on day 0, takes 10 days to complete, finishes on day 10
Job B: Starts on day 10, takes 20 days to complete, finishes on day 30
Job C: Starts on day 30, takes 15 days to complete, finishes on day 45
Job D: Starts on day 45, takes 5 days to complete, finishes on day 50
Job E: Starts on day 50, takes 8 days to complete, finishes on day 58

Total time taken = (10+20+15+5+8) = 58 days
Number of jobs = 5

Mean completion time = Total time taken / Number of jobs = 58/5 = 11.6

Therefore, the closest option is B)22 days.

If the Following Jobs Are Sequenced According to the First-Come-First-Served