The following jobs are waiting to be processed at Rick? Solano\'s machine center
ID: 335129 • Letter: T
Question
The following jobs are waiting to be processed at Rick? Solano's machine center.? Solano's machine center has a relatively long backlog and sets a fresh schedule every 2? weeks, which does not disturb earlier schedules. Below are the jobs to be scheduled? today, which is day 241 ?(day 241 is a work? day). Job names refer to names of clients and contract numbers. Compute all times based on initiating work on day 241.
(Job) (Date Job Received) (Due Date Duration (days))
BR-02 225 270 25
CX-01 230 320 35
DE-06 235 360 40
RG-05 231 310 30
SY-11 228 300 15
Using the SPT? (shortest processing? time) decision rule for sequencing the? jobs, the order is? (to resolve a? tie, use the order in which the jobs were? received):
The average tardiness? (job lateness) for the sequence developed using the SPT rule? =
The percentage utilization for the sequence developed using the SPT rule?=
The average completion time for the sequence developed using the SPT rule?=
The average number of jobs in the system for the sequence developed using the SPT rule? =
Explanation / Answer
The SPT rule in the following:-
Average completion time = total flow time/ no. Of jobs
= 1149 / 5
= 229.8 days
Utilisation = total processing time / total flow time
= 25 / 1149
=. 0.02175 %
Average no. of jobs = total flow time / total processing time
= 1149 / 25
=. 45.96 Jobs
Average jobs delay = total delays days / no. of jobs
= 145/ 5
= 29 days
Job sequence processing time Flow time Due date Delays BR 02 225 270 25 CX 01 230 320 35 DE 06 235 360 40 RG 05 231 310 30 SY 11 228 300 15 251149 1560 145
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