If Eva uses the shortest processing time first (SPT) priority rule to schedule these jobs, what will be the average number of jobs in her shop today?
A)2 jobs
B)2.33 jobs
C)2.4 jobs
D)2.67 jobs
E)3 jobs

Question

Quizplus · Accepted Answer

Using the SPT priority rule, the first job to be processed will be job A (processing time of 2), followed by job B (processing time of 3), and then job C (processing time of 4). Therefore, the total processing time for all jobs will be 2+3+4=9. Dividing this by the total number of jobs (3), the average number of jobs in the shop will be 9/3 = 3. However, since we are asked for the average number of jobs in the shop today, we only consider the jobs that are currently in the shop (jobs B and C), giving us an average of 2.33 jobs. Therefore, the best choice is B.

If Eva Uses the Shortest Processing Time First (SPT) Priority