Question

Problem 15.18 E Question Help Using the FCFS (first come, first served) decision rule for sequencing the jobs, the order is: The following jobs are waiting to be prooessed at Rick Sclano's machine center. Solanos 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 Due Date Duration (days) Job Recelved BR-02 CX-01 225 270 DE-06 230 320 RG-05 235 360 SY-11 300 25 35 40 30 231

Answer 1

FCFS = First come first serve, arranged in order from time arrived
Job Sequence (As per FCFS)	Job processing time (days)	Flow time	Job end date	Job due date (Days)	Days past due = Job end date - job due date
CX-01	25	25	265	270	0
BR-02	15	40	280	300	0
DE-06	35	75	315	320	0
SY-11	30	105	345	310	35
RG-05	40	145	385	360	25
		390			60

CX-01 starts on day 241 and ends on day 265. From there we ad processing times to arrive at end date of each job.

Average completion time = Total flow time / 5 = 390 / 5 =78 days

Average job lateness = Total late days / 5 = 60/5 = 12 days