Production and Operations Analysis, Seventh Edition
7th Edition
ISBN: 9781478623069
Author: Steven Nahmias, Tava Lennon Olsen
Publisher: Waveland Press, Inc.
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 9, Problem 40AP
Summary Introduction
Interpretation: The sequence of the work which is required for the minimization of the total time required for all six clients is to be determined.
Concept Introduction:
Tardiness is used to calculate the difference between the actual completion time and the required due date of the job. Any tardy jobs get completed after the due date of the job.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
An independent accountant is planning to prepare tax returns for six of her clients.Prior to her actually preparing each return, her secretary checks the client’s file to besure all the necessary documentation is there and obtains all the tax forms needed forthe preparation of the return. Based on past experience with the clients, her secretaryestimates that the following times (in hours) are required for preparation of the returnand for the accountant to complete the necessary paperwork prior to filing each return:Client Secretary Time Accountant Time1 1.2 2.52 1.6 4.53 2.0 2.04 1.5 6.05 3.1 5.06 0.5 1.5In what order should the work be completed in order to minimize the total timerequired for all six clients?
Given the following information on job times and due dates.
Job
Job Time(Hours)
Due Date(Hours)
a
3.5
7
b
2.0
6
c
4.5
18
d
5.0
22
e
2.5
4
f
6.0
20
a-1. Determine the optimal processing sequence using (1) First come, first served, (2) Shortest processing time, (3) Earliest due date, and (4) Critical ratio.
Sequence for First come, first served
Sequence for Shortest processing time
Sequence for Earliest due date
Sequence for Critical ratio
a-2. For each method, find the average job flow time and the average job tardiness. (Round your answers to 2 decimal places.)
First Come, FirstServed
Shortest ProcessingTime
Earliest Due Date
Critical Ratio
Average flow time
Average job tardiness
Currently a company that designs Web sites has six customers in its backlog. The time since the order arrived, processing time, and promised due dates are given in the following table.
Job
Time Since Order Arrived
(days ago)
Processing Time
(days)
Due Date
(days from now)
A
6
18
48
B
4
22
52
C
1
30
70
D
10
14
28
E
7
12
56
F
5
20
62
Develop a schedule by using the first-come, first-served (FCFS) rule and calculate the average flow time and average days past due for the schedule.
Develop a schedule by using the earliest due date (EDD) rule and calculate the average flow time and average days past due for the schedule.
Comment on the performance of the FCFS and EDD rules relative to average flow time and average days past due.
Chapter 9 Solutions
Production and Operations Analysis, Seventh Edition
Ch. 9.5 - Prob. 1PCh. 9.5 - Prob. 2PCh. 9.5 - Prob. 3PCh. 9.5 - Prob. 4PCh. 9.5 - Prob. 5PCh. 9.6 - Prob. 6PCh. 9.6 - Prob. 7PCh. 9.6 - Prob. 8PCh. 9.6 - Prob. 9PCh. 9.6 - Prob. 10P
Ch. 9.7 - Prob. 11PCh. 9.7 - Prob. 12PCh. 9.7 - Prob. 13PCh. 9.7 - Prob. 14PCh. 9.7 - Prob. 15PCh. 9.7 - Prob. 16PCh. 9.7 - Prob. 17PCh. 9.8 - Prob. 18PCh. 9.8 - Prob. 19PCh. 9.8 - Prob. 20PCh. 9.8 - Prob. 21PCh. 9.8 - Prob. 22PCh. 9.9 - Prob. 23PCh. 9.9 - Prob. 24PCh. 9.9 - Prob. 25PCh. 9.10 - Prob. 27PCh. 9.10 - Prob. 28PCh. 9.10 - Prob. 29PCh. 9 - Prob. 30APCh. 9 - Prob. 31APCh. 9 - Prob. 32APCh. 9 - Prob. 33APCh. 9 - Prob. 34APCh. 9 - Prob. 35APCh. 9 - Prob. 36APCh. 9 - Prob. 37APCh. 9 - Prob. 38APCh. 9 - Prob. 39APCh. 9 - Prob. 40APCh. 9 - Prob. 41APCh. 9 - Prob. 42APCh. 9 - Prob. 43APCh. 9 - Prob. 44APCh. 9 - Prob. 45APCh. 9 - Prob. 46APCh. 9 - Prob. 47AP
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, operations-management and related others by exploring similar questions and additional content below.Similar questions
- A mortgage service office has the following four activities involved in approving a loan application. Note that a working day is 8 hours and there are 60 minutes in one hour. Activity Time (minutes) A. Property survey 24 B. Credit report 19 C. Title search 18 D. Final decision 20 The office has three employees, activities A, B and C are combined together and assigned to two employees, while the other employee is responsible for the last activity D. Under this setting, what would be the maximum number of loan applications the office can process per day? Numbers only, keep three decimals if not exact, either round up or down is okarrow_forwardDan is a member of a four person sales team in a gourmet kitchen shop. All of the sales team members have been cross trained in the daily assignments that must be completed. Their first task each day is to restock shelves, clean and prepare the store for opening. Dan is often late to work, arriving just a few minutes before opening time. He is an excellent salesperson and loves to work with customers on the floor. He will often trade his cashiering shirt with another team member so that he can work with customers. His excellent sales record helps to ensure that his team always meets their sales goal. However, some of the team members are complaining that is not a good team player. How would you feel about working with Dan? b. What would you do it you were the store manager? Why?arrow_forwardAt the campus copy shop, six jobs have arrived in the order shown (A, B, C, D, E, and F) at the beginning of the day 1 (today, which is a work day). All of the jobs are due at various times today. Your job is to evaluate four common sequencing rules. JOB DUE (IN HOURS) DURATION (HOURS REQUIRED) A 8 (this job is due in 8 hours) 1.65 B 5.5 (this job is due in 5.5 hours) 1.20 C 4.5 (this job is due after lunch in 4.5 hours) 0.85 D 6 (this job is due in 6…arrow_forward
- A manufacturer is designing a product layout for a new product production. It plans to use a production line for 8 hours per day in order to meet forecasted demand of 100 units per day. The product requires 7 tasks in total. These tasks are namely, A, B, C, D, E, F, and G respectively. Task A does not have any predecessor to start. To start Task B, it requires Task A to be completed. Starting tasks C needs, the task B to be completed. Also, starting task D needed task B to be completed. Task E can only start upon completion of Task C. Whereas starting task F needs the completion of both the tasks D and E. Finally, starting task G needed, task F to be completed. The processing times for tasks, A, B, C, D, E, F, and G are 2.8, 2.1,0.9, 1.0, 1.2, 1.8, are 4.7 minutes respectively. Applying the most following tasks rule for balancing the assembly line, with ties broken according to longest task tíme first. What will be the idle time for the FOURTH Workstation? Select one: O a 20 O 6.0.1…arrow_forwardA manufacturer is designing a product layout for a new product production. It plans to use a production line for 8 hours per day in order to meet forecasted demand of 100 units per day. The product requires 7 tasks in total. These tasks are namely, A, B, C, D, E, F, and G respectively. Task A does not have any predecessor to start. To start Task B, it requires Task A to be completed. Starting tasks C needs, the task B to be completed. Also, starting task D needed task B to be completed. Task E can only start upon completion of Task C. Whereas starting task F needs the completion of both the tasks D and E. Finally, starting task G needed, task F to be completed. The processing times for tasks, A, B, C, D, E, F, and G are 2.8, 2.1, 0.9, 1.0, 1.2, 1.8, are 4.7 minutes respectively. Applying the most following tasks rule for balancing the assembly line with ties broken according to longest task time first, the tasks that will be assigned to the SECOND workstation are: a. B,C and D b. C…arrow_forwardA manufacturer is designing a product layout for a new product production. It plans to use a production line for 8 hours per day in order to meet forecasted demand of 100 units per day. The product requires 7 tasks in total. These tasks are namely, A, B, C, D, E, F, and G respectively. Task A does not have any predecessor to start. To start Task B, it requires Task A to be completed. Starting tasks C needs, the task B to be completed. Also, starting task D needed task B to be completed. Task E can only start upon completion of Task C Whereas starting task F needs the completion of both the tasks D and E. Finally, starting task G needed, task F to be completed. The processing times for tasks, A, B, C, D, E, F, and Gare 2.8, 2.1,0.9, 1.0, 1.2, 1.8, are 4.7 minutes respectively. How many minimum numbers of workstations are needed? Select one: O a.2 O b. None is the correct answer O c.6 O d. 8 O e. 4arrow_forward
- An architect has five projects to complete. She estimates that three of the projects willrequire one week to complete and the other two will require three weeks and four weeks.During the time these projects are completed (and assuming no other projects areworked on during this time), what is the architect’s flow rate (projects per week)?arrow_forwardFive jobs must be scheduled for batch processing on a mainframe computer system. The processing times and the promised times for each of the jobs are listedhere.Job 1 2 3 4 5Processing time 40 min 2.5 hr 20 min 4 hr 1.5 hrPromised time 11:00 A.M. 2:00 P.M. 2:00 P.M. 1:00 P.M. 4:00 P.M.Assume that the current time is 10:00 A.M.a. If the jobs are scheduled according to SPT, find the tardiness of each job and themean tardiness of all jobs.b. Repeat the calculation in part (a) for EDD schedulingarrow_forwardA local bakery makes custom cakes for special eventssuch as weddings and graduations. Making cakes is a two-step process of baking and decorating. The bakery has received eight orders, and the times required in hours for baking and decorating for each order are given in the following table:Cake Orders Baking DecoratingA 3 4B 1 2C 4 7D 2 4E 5 10F 2 6G 5 7H 6 13Determine a sequence that will minimize the makespan time.Construct a chart of the resulting sequence, and determine the idle time in te decoration process.arrow_forward
- Given the data below, using the SPT heuristic sequencing rule, determine the completion date and tardiness for each job as well as the average completion time and average tardiness for all four jobs. Which of the following statements is true? Job Processing time (days) Due date (in days) A 10 10 B 5 8 C 15 25 D 8 15 a.Jobs B and D will have no tardiness b.The tardiness for Job A is 12 days c.The average tardiness is 19.75 d.The average completion time is 6.5arrow_forwardA manufacturer is designing a product layout for a new product production. It plans to use a production line for 8 hours per day in order to meet forecasted demand of 90 units per day. The product requires 7 tasks in total. These tasks are namely, A, B, C D E F and G respectively. Task A does not have any predecessor to start. To start Task B, it requires Task A to be completed, Starting tasks needs the task to be completed. Also starting task D, needed task B to be completed. Task E can only start upon completion of Task C. Whereas starting task F needs the completion of both the tasks D and E. Finally, starting task G needed, task F to be completed. The processing times for tasks, A, B, C, D, E, F. and G are 28.2.1,0.9, 10, 1.2.1.8 are 4.7 minutes respectively. How many minimum numbers of workstations are needed? a. 1 b. 6 c. None is correct d. 3 e. 5 please I neef answer along with the formula don't put it on excelarrow_forwardA supervisor drafts the department's hiring plan for the next six months and decides how many new employees will be needed. According to the time horizon, this is A Long-term B Intermediate C Program D Short-term E Projectarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Practical Management ScienceOperations ManagementISBN:9781337406659Author:WINSTON, Wayne L.Publisher:Cengage,
Practical Management Science
Operations Management
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:Cengage,