Operations Management
11th Edition
ISBN: 9780132921145
Author: Jay Heizer
Publisher: PEARSON
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Textbook Question
Chapter 3, Problem 14P
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?
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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…
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).…
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
Operations Management
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 - Describe how expected activity times and variances...
Ch. 3 - Define earliest start, earliest Finish, latest...Ch. 3 - Students are sometimes confused by the concept of...Ch. 3 - What are dummy activities? Why are they used in...Ch. 3 - What are the three time estimates used with PERT?Ch. 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 - The work breakdown structure (WBS) for building a...Ch. 3 - 3.2 Robert Day has decided to run for a seat as...Ch. 3 - Draw the activity-on-node (AON) project network...Ch. 3 - Given the activities whose sequence is described...Ch. 3 - 3.5 Using AOA, diagram the network described below...Ch. 3 - Stephen Hall is developing a program in supply...Ch. 3 - Task time estimates for the modification of an...Ch. 3 - 3.8 The City Commission of Nashville has decided...Ch. 3 - Refer to the table in Problem 3.8. a. Draw the AON...Ch. 3 - The activities needed to build a prototype laser...Ch. 3 - Dave Fletcher (see Problem 3.10) was able to...Ch. 3 - The activities described by the following table...Ch. 3 - A renovation of the gift shop at Orlando Amway...Ch. 3 - Kelle Carpet and Trim installs carpet in...Ch. 3 - The following is a table of activities associated...Ch. 3 - Assume that the activities in Problem 3.15 have...Ch. 3 - Bill Fennema, president of Fennema Hospitality,...Ch. 3 - What is the minimum cost of crashing the following...Ch. 3 - Three activities are candidates for crashing on a...Ch. 3 - Development of Version 2.0 of a particular...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 - Using PERT, Adam Munson was able to determine that...Ch. 3 - Clark Products makes pizza ovens for commercial...Ch. 3 - The Tesla 6 is a new custom-designed sports car....Ch. 3 - TABLE 3.6 Southwestern University Project 1....Ch. 3 - TABLE 3.6 Southwestern University Project 2 What...Ch. 3 - TABLE 3.6 Southwestern University Project 3. If it...Ch. 3 - Project Management at Arnold Palmer Hospital Video...Ch. 3 - The equivalent of a new kindergarten class is born...Ch. 3 - The equivalent of a new kindergarten class is born...Ch. 3 - The equivalent of a new kindergarten class is born...Ch. 3 - At the Hard Rock Cafe, like many organizations,...Ch. 3 - At the Hard Rock Cafe, like many organizations,...Ch. 3 - At the Hard Rock Cafe, like many organizations,...Ch. 3 - At the Hard Rock Cafe, like many organizations,...
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