Principles of Operations Management: Sustainability and Supply Chain Management (10th Edition)
10th Edition
ISBN: 9780134181981
Author: Jay Heizer, Barry Render, Chuck Munson
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 3, Problem 19P
Kelle Carpet and Trim installs carpet in commercial offices. Peter Kelle has been very concerned with the amount of time it took to complete several recent jobs. Some of his workers are very unreliable. A list of activities and their optimistic completion time, the most likely completion time, and the pessimistic completion time (all in days) for a new contract are given in the following table:
a) Determine the expected completion time and variance for each activity.
b) Determine the total project completion time and the critical path for the project.
c) Determine ES, EF, LS, LF, and slack for each activity.
d) What is the probability that Kelle Carpet and Trim will finish the project in 40 days or less?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Al construction has developed tasks duration and predecessor relationships in the following table for building model houses. The manager has been concerned with the amount of time it took to complete several jobs, some of the company workers are very unreliable. A list of activities and their optimistic completion time, the most likely time and the pessimistic completion time (in days) for a new contract are given in the following table.
Activity
Predecessors
Optimistic (a)
Most likely (m)
Pessimistic (b)
A
--
1
2
3
B
-
2
3
4
C
A
4
5
6
D
B
8
9
10
E
C, D
2
5
8
F
D
4
5
6
G
E
1
2
3
1.Draw the activity network for this new contract (either AON or AOA).
2. Determine the Expected Time and Variance for each activity.
3.. Show the activity schedule (ES, EF, LS, and LF) as well as slack (in table).…
What's the best way to resolve this problem?
Kelle Carpet and Trim installs carpet in commercial offices. Peter Kelle has been very concerned with the amount of time it took to complete several recent jobs. Some of his workers are very unreliable. A list of activities and their optimistic completion time, the most likely completion time, and the pessimistic completion time (all in days) for a new contract are given in the following table:
Activity
a
m
b
Immediate Predecessor(s)
Activity
a
m
b
Immediate Predecessor(s)
A
3
5
9
-
G
1
2
3
A, E
B
4
5
6
-
H
4
6
8
F
C
1
2
3
-
I
10
11
12
G
D
7
8
9
C
J
15
17
19
C
E
1
3
5
B, D
K
4
8
12
H, I
F
5
10
15
A, E
b) Activities on the critical path for the project are C - D - E - F - H - K
c) For the given project, the earliest start (ES) and earliest finish (EF) are:
For the given project, the latest start (LS) and latest finish (LF) are:
(Round your responses to two decimal places.)
Referring to the…
Kelle Carpet and Trim installs carpet in commercial offices. Peter Kelle has been very concerned with the amount of time it took to complete several recent jobs. Some of his workers are very unreliable. A list of activities and their optimistic
completion time, the most likely completion time, and the pessimistic completion time (all in days) for a new contract are given in the following table:
Activity a
A
4
10
11
с
1
7
8
M
2
4
1
7
11
10
11
4
J
13
5
BCDEFGH-X
K
This exercise contains only part a.
a) Based on the activity time estimates, the expected times and variance for each of the activities are:
(Round your responses to two decimal places.)
Activity
Time (days)
DEF I - X
K
m
5
2
2
6
15
9
Immediate
b Predecessor(s)
9
12
3963 HZ873
14
12
17
13
1105
Expected Time
A
B
C
III
G
H
B, D
A, E
A, E
F
G
C
H, I
Variance
Chapter 3 Solutions
Principles of Operations Management: Sustainability and Supply Chain Management (10th Edition)
Ch. 3 - Ethical Dilemma Two examples of massively...Ch. 3 - Give an example of a situation in which project...Ch. 3 - Explain the purpose of project organization.Ch. 3 - What are the three phases involved in the...Ch. 3 - What are some of the questions that can be...Ch. 3 - Define work breakdown structure. How is it used?Ch. 3 - What is the use of Gantt charts in project...Ch. 3 - What is the difference between an...Ch. 3 - What is the significance of the critical path?Ch. 3 - what would a project manager have to do to crash...
Ch. 3 - Prob. 10DQCh. 3 - Define earliest start, earliest finish, latest...Ch. 3 - Students are sometimes confused by the concept of...Ch. 3 - Prob. 13DQCh. 3 - Prob. 14DQCh. 3 - Would a project manager ever consider crashing a...Ch. 3 - How is the variance of the total project computed...Ch. 3 - Describe the meaning of slack, and discuss how it...Ch. 3 - How can we determine the probability that a...Ch. 3 - Name some of the widely used project management...Ch. 3 - What is the difference between the waterfall...Ch. 3 - The work breakdown structure (WBS) for building a...Ch. 3 - James Lawson has decided to run for a seat as...Ch. 3 - Prob. 3PCh. 3 - Refer to the table in Problem 3.3. a) Draw the AON...Ch. 3 - Draw the activity-on-node (AON) project network...Ch. 3 - Given the activities whose sequence is described...Ch. 3 - Prob. 7PCh. 3 - Roger Ginde is developing a program in supply...Ch. 3 - Prob. 9PCh. 3 - The activities described by the following table...Ch. 3 - Prob. 11PCh. 3 - The activities needed to build a prototype laser...Ch. 3 - Dave Fletcher (sec Problem 3.12) was able to...Ch. 3 - The Rover 6 is a new custom-designed sports car....Ch. 3 - Ross Hopkins, president of Hopkins Hospitality,...Ch. 3 - A renovation of the gift shop at Orlando Amway...Ch. 3 - Kelle Carpet and Trim installs carpet in...Ch. 3 - The estimated times and immediate predecessors for...Ch. 3 - Rich Cole Control Devices, Inc., produces...Ch. 3 - Four Squares Productions, a firm hired to...Ch. 3 - Prob. 23PCh. 3 - Prob. 28PCh. 3 - Prob. 29PCh. 3 - Prob. 30PCh. 3 - Development of Version 2.0 of a particular...Ch. 3 - Prob. 32PCh. 3 - Prob. 1CSCh. 3 - Prob. 2CSCh. 3 - Prob. 3CSCh. 3 - Prob. 1.1VCCh. 3 - Prob. 1.2VCCh. 3 - Project Management at Arnold Palmer Hospital The...Ch. 3 - Prob. 1.4VCCh. 3 - Managing Hard Rocks Rockfest At the Hard Rock...Ch. 3 - Managing Hard Rocks Rockfest At the Hard Rock...Ch. 3 - Managing Hard Rocks Rockfest At the Hard Rock...Ch. 3 - Managing Hard Rocks Rockfest At the Hard Rock...
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
- Kelle Carpet and Trim installs carpet in commercial offices. Peter Kelle has been very concerned with the amount of time it took to complete several recent jobs. Some of his workers are very unreliable. A list of activities and their optimistic completion time, the most likely completion time, and the pessimistic completion time (all in days) for a new contract are given in the following table: Time (days) Activity a 3 5 3 4 1 2 7 TH 3 10 10 ABCD E F G H I K 61 525DE5 13 m Activity A 3 7 11 15 9 This exercise contains only part a. a) Based on the activity time estimates, the expected times and variance for each of the activities are: (Round your responses to two decimal places.) b 9 5 3 8 5 13 49127 13 Immediate Predecessor(s) Expected Time C B, D A, E A, E F G C H, I Variancearrow_forwardKelle Carpet and Trim installs carpet in commercial offices. Peter Kelle has been very concerned with the amount of time it took to complete several recent jobs. Some of his workers are very unreliable. A list of activities and their optimistic completion time, the most likely completion time, and the pessimistic completion time (all in days) for a new contract are given in the following table: Time (days) Immediate Activity Predecessor(s) a A 3 8 B 4. 5 3 D 7 8 6. В, D А, Е А, Е E 1 3 F 2 3 4 7 9 13 11 12 13 F 7 J 15 17 19 K 4 12 H, I This exercise contains only part a. a) Based on the activity time estimates, the expected times and variance for each of the activities are: (Round your responses to two decimal places.) Activity Expected Time Variance Aarrow_forwardMOORE HOUSING CONTRACTORS Moore Housing Contractors is negotiating a deal with Countryside Realtors to build six houses in a new develop- ment. Countryside wants Moore Contractors to start in late winter or early spring, when the weather begins to moder- ate, and build on through the summer and into the fall. The summer months are an especially busy time for the realty company, and it believes it can sell the houses almost as soon as they are ready, and maybe even before. The houses all have similar floor plans and are of approximately equal size; only the exteriors are noticeably different. The comple- tion time is so critical for Countryside Realtors that it is insisting that a project management network accompany the contractor's bid for the job, with an estimate of the comple- tion time for a house. The realtor also needs to be able to plan its offerings and marketing for the summer. It wants each house to be completed within 45 days after it is started. Activity b C d f 8 h i j k…arrow_forward
- Given the information below, estimate the probability that the noncritical path B-C-G will take more than 15 weeks. Hint: Subtract from 1.0 the probability that B-C-G will take 15 weeks or less. Refer to the standard normal table. Question Viewer Activity Expected Time (weeks) Variance A 4.0 1.00 B 5.5 0.96 C 4.0 0.15 D 11.5 1.52 E 6.5 2.40 F 8.5 2.55 G 5.0 0.69 The probability that this path will take more than 15 weeks to complete is ☐. (Enter your response rounded to four decimal places.)arrow_forwardPlease answer activity A-karrow_forwardExample: Undertaking by a contractor to implement a contracting for excavation works according to the scheme below, undertaking to complete the work within a period of 36 weeks with a probability of 99% between in light of the contractor's probability. The actual time period for the completion of the project within the PERT technology? Act. a b te u C.P 1-2 7 8. 6.33 1 1 *1,2 2-3 6. 9 6.33 0.66 0.443 *2 2-4 3 7 8. 6.5 0.83 .693 *1 2-5 4 6. 0.33 3-6 9. 10 8.66 0.66 0.443 *2 4-7 6. 8 11 8.166 0.83 .693 *1 5-7 4 7 5.83 0.5 6-8 7 10 7.16 0.83 .693 *2 7-8 4 8 7.5 0.83 .693 *1 8-9 4 7 9 6.83 0.83 .693 *1,2arrow_forward
- I'm unable to answer the following question? What is the total cost of crashing the project from its current duration down to 13 weeks?arrow_forwardRoss Hopkins, president of Hopkins Hospitality, has developed the tasks, durations, and predecessor relationships in the following table for building new motels. Draw the AON network and answer the questions that follow. a) What is the expected (estimated) time for activity C?b) What is the variance for activity C?c) Based on the calculation of estimated times, what is the criticalpath?d) What is the estimated time of the critical path?e) What is the activity variance along the critical path?f) What is the probability of completion of the project before week 36?arrow_forwardAssuming that you are a project manager for a consulting firm that is planning a feasibility study for a new city centre scheme. The activities for the final phase of the study project have been identified. The logical relationships for the identified activities is as shown in the dependency table below. Table 3.2: Activities for the Final Phase of a Feasibility Study Activity Immediate /predecessor (s) Duration (weeks) No. of Staff Needed A 3 B 5 3 C 4 B D A 7 2 E B.C 8 2 F C 6 5 G EF B 3 H F 10 B D.G 6 5 Table 3.2: Dependency Table Based on the information provided in the table: i. Draw and analyze the network diagram; and ii. Indicate the type of dependency relationships.arrow_forward
- Omar has recently been hired as the HIM director at a large medical center. He realizes that he has a number of employees whose job duties would allow them to work from home. Because his boss has asked him for a space reduction proposal, he recognizes the need to implement a work-at-home program for his employees. What steps should Omar take in developing a security program for the employees who will work from home? Develop a checklist of considerations, along with a list of resources that would facilitate his security program.arrow_forwardProject planners have sought the judgment of various knowledgeable engineers, vendors and foremen and have developed the time estimates for the plant construction project as shown in the table below. Activity Estimates Predecess Time (months) or Description Code A a 9 Design plant Select Site Select Personnel 11 8 None 16 B A 2 35 C A 1 4 5 Select Vendor D A 3 4 9. Project site Manufacture generator Prepare manual Install generator Train operators License E 12 20 F 15 18 28 8 E,F D,G 2 4 8 5 8 12 J H,I 5 14 a. Construct the PERT network for the project. b. Find the critical path and its standard deviation. c. Determine the slack time of all activities of the project.arrow_forwardKelle Carpet and Trim installs carpet in commercial offices. Peter Kelle has been very concerned with the amount of time it took to complete several recent jobs. Some of his workers are very unreliable. A list of activities and their optimistic completion time, the most likely completion time, and the pessimistic completion time (all in days) for a new contract are given in the following table: Time (days) Immediate Activity a m b Predecessor(s) A 4 6 8 — B 10 11 12 — C 1 2 3 — D 7 8 9 C E 1 3 5 B, D F 1 2 3 A, E G 6 10 13 A, E H 10 11 12 F I 4 6 8 G J 14 16 18 C K 5 9 13 H, I This…arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Practical Management ScienceOperations ManagementISBN:9781337406659Author:WINSTON, Wayne L.Publisher:Cengage,
Operations ManagementOperations ManagementISBN:9781259667473Author:William J StevensonPublisher:McGraw-Hill Education
Operations and Supply Chain Management (Mcgraw-hi...Operations ManagementISBN:9781259666100Author:F. Robert Jacobs, Richard B ChasePublisher:McGraw-Hill Education
Purchasing and Supply Chain ManagementOperations ManagementISBN:9781285869681Author:Robert M. Monczka, Robert B. Handfield, Larry C. Giunipero, James L. PattersonPublisher:Cengage Learning
Production and Operations Analysis, Seventh Editi...Operations ManagementISBN:9781478623069Author:Steven Nahmias, Tava Lennon OlsenPublisher:Waveland Press, Inc.
Practical Management Science
Operations Management
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:Cengage,
Operations Management
Operations Management
ISBN:9781259667473
Author:William J Stevenson
Publisher:McGraw-Hill Education
Operations and Supply Chain Management (Mcgraw-hi...
Operations Management
ISBN:9781259666100
Author:F. Robert Jacobs, Richard B Chase
Publisher:McGraw-Hill Education
Purchasing and Supply Chain Management
Operations Management
ISBN:9781285869681
Author:Robert M. Monczka, Robert B. Handfield, Larry C. Giunipero, James L. Patterson
Publisher:Cengage Learning
Production and Operations Analysis, Seventh Editi...
Operations Management
ISBN:9781478623069
Author:Steven Nahmias, Tava Lennon Olsen
Publisher:Waveland Press, Inc.
Inventory Management | Concepts, Examples and Solved Problems; Author: Dr. Bharatendra Rai;https://www.youtube.com/watch?v=2n9NLZTIlz8;License: Standard YouTube License, CC-BY