Question

The owner/operator of the local franchise of Handyman, Inc., has four jobs to do today, shown in the order they were received:

Processing Due

Job Time (days) Date (Days)

W 4 4

X 3 5

Y 2 2

Z 1 1

If he uses the shortest processing time first (SPT) priority rule to schedule these jobs, what will be the average number of jobs in his shop today?

A.

0

B.

1

C.

2

D.

3

E.

4

Answer 1

Answer: C-2

Explanation:

Job are sequenced according to SPT-Shortest processing time

Job	Duration	Due date	In flow time	Out Flow time
Z	1	1	0	1
Y	2	2	1	3
X	3	3	3	6
W	4	4	6	10
total				20

Average no. of Jobs per day= (sum job flow times)/ No. days to complete batch

                           = (20)/10 = 2 job