Question

Eva, the owner of eva's second time around wedding dresses, currently has five dresses to be altered, shown in the order in which they arrived: job processing time (hrs) due (hrs from now) v 3 5 w 1 1 x 4 9 y 2 3 z 5 7 if eva uses the first come, first served priority rule to schedule these jobs, what will be the average completion time? 5 hours 7 hours 7.2 hours 3 hours 8 hours

Answer 1

8 hours

Explanation:

Let the times be:

dress 1 = 3

dress 2 = 4

dress 3 =8

dress 4 = 10

dress 5 = 15

Therefore, the average processing time to work on the dress is:

`(3+4+8+10+15)/(5)\\ = 8 hours`

Answer 2

8 hours

Explanation:

Job v starts at time 0 and completes at time 3.

Job w starts at time 1 and completes at time 4.

Job x starts at time 4 and completes at time 8.

Job y starts at time 8 and completes at time 10.

Job z starts at time 10 and completes at time 15.

The average completion time is (3 +4 +8 +10 +15)/5 = 8 . . . hours.

_____

Comment on the schedule

Jobs v and x are the only ones completed by the time due. The latest is 8 hours late. If they are scheduled in order of due time, jobs v, w, and y can be completed by the due time; the others will be 4 and 6 hours late.