I NEED D AND E BE ANSWERED I answered a,b,c (a) First-come-first-serve ANS: Mean flow time =17.4 Mean Process time=5,2 The number of jobs in the system =Mean flow time /Mean Process time=17.4/5.2=3.34 days (b) Earliest due date ANS Mean flow time =12.2 Mean days past due date=0 No. of jobs in the system=61/26=3.24 (c) Shortest processing time ANS Mean flow time =11.2 Mean days past due date=1.2 No. of jobs in system=56/26=2.153
I NEED D AND E BE ANSWERED I answered a,b,c
(a) First-come-first-serve
ANS:
Mean Process time=5,2
The number of jobs in the system =Mean flow time /Mean Process time=17.4/5.2=3.34 days
(b) Earliest due date
ANS
Mean flow time =12.2
Mean days past due date=0
No. of jobs in the system=61/26=3.24
(c) Shortest processing time
ANS
Mean flow time =11.2
Mean days past due date=1.2
No. of jobs in system=56/26=2.153
(d) Which rule should be used, in your opinion? Why?
(e) The head mechanic at the production facility wants to perform maintenance
on the bottleneck workstation used to process the jobs above. The
mechanic insists the maintenance needs to be performed before day 45,
and has indicated that the maintenance will take 3 days to complete and
will take the workstation offline. Considering it is still day 13, when is
the best time to perform the maintenance? (Hint: Treat the maintenance
as though it is a new job.)
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