Principles Of Operations Management
11th Edition
ISBN: 9780135173930
Author: RENDER, Barry, HEIZER, Jay, Munson, Chuck
Publisher: Pearson,
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Chapter 15, Problem 24P
a)
Summary Introduction
To sequence: The given jobs based on the lowest processing time (LPT).
b)
Summary Introduction
To calculate: The average completion time.
c)
Summary Introduction
To calculate: The average job lateness.
d)
Summary Introduction
To calculate: The average number of jobs in the system.
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The following jobs are waiting to be processed at a small machine center: AU dates are specified as manufacturing planning calendar days.Assume that all jobs arrived on day 210 (yesterday) in the ordershown but are not scheduled to begin until day 211 (today).a) Sequence the jobs according to LPT.b) What is the average completion (flow) time?c) What is the average job la teness?d) What is the average number of jobs in the system?
If the jobs displayed in Table 18.23 are processed using the earliest-due-date rule, whatis the average flow time?
The following jobs are waiting to be processed at a small machine center;
JOB
10
20
30
40
50
days (round your response to one decimal place).
DUE DATE
260
254
260
265
275
days (round your response to one decimal place).
DURATION (DAYS)
All dates are specified as manufacturing planning calendar days. Assume that all jobs arrived on day 200 (yesterday) in the order shown but are not scheduled to begin until day 201 (today).
a) Sequence the jobs according to LPT.
According to the LPT rule, the sequence of jobs should be 50, 20, 10, 30, 40
b) What is the average completion (flow) time?
The average completion (flow) time is
c) What is the average job lateness?
The average job lateness is
d) What is the average number of jobs in the system?
The average number of jobs in the system is jobs (round your response to one decimal place).
18
22
14
4
32
Chapter 15 Solutions
Principles Of Operations Management
Ch. 15 - Prob. 1EDCh. 15 - Prob. 1DQCh. 15 - Prob. 2DQCh. 15 - Prob. 3DQCh. 15 - Prob. 4DQCh. 15 - Prob. 5DQCh. 15 - Prob. 6DQCh. 15 - Prob. 7DQCh. 15 - Prob. 8DQCh. 15 - Prob. 9DQ
Ch. 15 - Prob. 10DQCh. 15 - Prob. 11DQCh. 15 - Prob. 12DQCh. 15 - Prob. 13DQCh. 15 - Prob. 1PCh. 15 - Prob. 2PCh. 15 - Prob. 3PCh. 15 - Prob. 4PCh. 15 - Prob. 5PCh. 15 - Prob. 6PCh. 15 - Prob. 7PCh. 15 - Prob. 8PCh. 15 - Prob. 9PCh. 15 - Prob. 10PCh. 15 - Prob. 11PCh. 15 - Prob. 12PCh. 15 - Prob. 13PCh. 15 - Prob. 14PCh. 15 - Prob. 15PCh. 15 - Prob. 16PCh. 15 - Prob. 17PCh. 15 - Prob. 18PCh. 15 - Prob. 19PCh. 15 - Prob. 20PCh. 15 - Prob. 21PCh. 15 - Prob. 22PCh. 15 - Prob. 23PCh. 15 - Prob. 24PCh. 15 - Prob. 25PCh. 15 - Prob. 26PCh. 15 - Prob. 27PCh. 15 - Prob. 28PCh. 15 - Daniels Barber Shop at Newark Airport is open 7...Ch. 15 - Given the following demand for waiters and...Ch. 15 - Prob. 1CSCh. 15 - Prob. 2CSCh. 15 - Prob. 3CSCh. 15 - Prob. 4CSCh. 15 - Prob. 1.1VCCh. 15 - Prob. 1.2VCCh. 15 - Prob. 1.3VCCh. 15 - Prob. 2.1VCCh. 15 - Prob. 2.2VCCh. 15 - Why is seniority important in scheduling servers?Ch. 15 - Prob. 2.4VC
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- Given the jobs displayed in Table 18.17, if SPT is used to sequence the jobs, what is theaverage flow time of jobs in the system?arrow_forwardWhat are the advantages and disadvantages of the shortest processing time (SPT) rule?arrow_forwardIf the jobs displayed in Table 18.23 are processed using the earliest-due-date rule, whatis the maximum tardiness?arrow_forward
- Processing time for eight projects, displayed in the sequence they arrived. Project P1 P2 P3 P4 P5 P6 P7 P8 Processing time (hours) 3 1 1 2 9 6 1 1.50 2. Given the projects displayed in table above, if FCFS is used to sequence the jobs, what is the average flow rate of the projects? Note: Round your answer to 2 decimal places. 3. Given the projects displayed in table above, if FCFS is used to sequence the jobs, what is the average flow time of the projects? Note: Round your answer to 1 decimal place. 4. Given the projects displayed in table above, if FCFS is used to sequence the jobs, what is the average inventory of the projects? Note: Use your rounded answers from Parts 2 and 3. Round your answer to 1 decimal place. 5. Given the projects displayed in table above, if SPT is used to sequence the jobs, what is the average flow rate of the projects? Note: Round your answer to 2 decimal places. 6. Given the projects displayed in table above, if SPT is used to sequence…arrow_forwardFive customers brought in computers to be repaired to a small shop. Estimated repair times (in days) and dates promised are given below. Due dates were set based on available technicians; however, one technician had a medical emergency and will be unavailable for at least two weeks so processing times were adjusted. Customer job 1 Processing time (days) Due date (days) 6 Use the EDD rule and compute the start time, flow time, lateness, and tardiness for each job. Use minus sign to enter negative lateness values, if any. If your answer is zero, enter "0". Sequence Start Time, days Flow Time, days Lateness, days Tardiness, days -Select- -Select- -Sclect. -Select- -Select- UI 5 LI TE 10 MAarrow_forwardFive jobs are ready for processing at time zero through a workstation. The details of the processing time and the due date of completion is provided in the following table. Job A B Processing Time (days) I5 Due Date 11 6 3 16 19 10 D E 15 Using the earliest due date (EDD) rule, the average lateness for the five jobs is decimal place. Round your answer to one Your Answer: Answerarrow_forward
- There are six jobs as below. The processing time (in days) and due date for each job are below. Job |arrow_forwardGiven the projects displayed in Table 18.21, if FCFS is used to sequence the jobs, whatis the average flow time of the projects (in hours)?arrow_forwardIf the jobs displayed in Table 18.20 are processed using the earliest-due-date rule, whatwould be the tardiness of job D?arrow_forwarda) Using the FCFS (first come, first served) decision rule for sequencing the jobs, the order is (assume that jobs came in the order in which they are listed in the table): Sequence 1 2 3 4 5 Job A B C E The average tardiness (job lateness) for the sequence developed using the FCFS rule = days (round your response to two decimal places) The following jobs are waiting to be processed at the same machine center. Jobs are logged as they arrive: Job A B C E Due Date 315 313 312 325 314 Duration (days) 3 8 16 40 5 All dates are specified as manufacturing planning calendar days. Assume that all jobs arrive on day 275. Assume each job starts at the beginning of the day and finishes at the end of the day (a job that begins on day 275 and takes 8 days will finish on day 282, and the next job begins in the morning of day 283). Compute all times based on initiating work on day 275.arrow_forwardIf the jobs displayed in Table 18.23 are processed using the earliest-due-date rule, whatwould be the tardiness of job E?arrow_forwardCourtney is a programmer receiving requests each week to analyze a large data base. Five jobs were on her desk Monday morning and she must decide in what order to write the code. Assume that all jobs arrived today (day 1 and hour 1), in the order shown below. Courtney has assigned the number of hours required to do the coding as noted. Note that Courtney works an 8-hour day and today is a work day. Due date Duration (hours Job (hours hence) required) A 8. 16 24 10 D 32 16 E 12 6 In what sequence would the jobs be ranked according to the following decision rules: FCFS, EDD, SPT, LPT? According to the FCFS rule, the sequence of jobs should be According to the EDD rule, the sequence of jobs should be According to the SPT rule, the sequence of jobs should be According to the LPT rule, the sequence of jobs should be Construct the table of measures of effectiveness for each rule (round your responses to one decimal place). Average number of jobs in system Average Flow Time Average Lateness…arrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_ios
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