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? =

Answer 1

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
	25	1149	1560	145

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