Operations Management
17th Edition
ISBN: 9781259142208
Author: CACHON, Gérard, Terwiesch, Christian
Publisher: Mcgraw-hill Education,
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Textbook Question
Chapter 19, Problem 8PA
A project consists of three tasks: A, B, and C. Task A is known to take five days for sure. Tasks B and C are each dependent on A. B takes five days. C takes seven days with a probability of 0.5 and three days with a probability of 0.5. What is the expected completion time of the project?
- a. 8 days
- b. 10 days
- c. 11 days
- d. 12 days
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Students have asked these similar questions
Limbo Technologies has embarked on another project that has an estimated completion time of 40 weeks and a standard deviation of 5 weeks. It is estimated that the project completion time is normally distributed.
i)What is the probability of finishing the project in 38 weeks or less?
ii)The due date for the project is set so that there is a 90% chance that it will finish by this date. What is the due duration?
ACTIVITY
PREDECESSOR
NORMAL TIME (WEEKS)
CRASH TIME (WEEKS)
NORMAL COST ($)
CRASH COST ($)
A
-
4
2
1000
1600
B
-
6
3
3000
3500
C
A
3
1
2500
3000
D
A,B
6
5
1500
1850
E
D
4
2
3500
4200
F
C
4
3
2250
3000
G
D
3
2
1900
2500
H
F,G,E
2
1
400
500
A project has the following tasks and duration estimates given. These three tasks are done in succession on a project.
Task
Optimistic Estimate
Most Likely Estimate
Pessimistic Estimate
Alpha
30 days
40 days
50 days
Beta
20 days
25 days
28 days
Charlie
4 days
10 days
12 days
Delta
25 days
30 days
50 days
What is the expected duration for the project? (3 points)
What is the variance for the project? (3 points)
What is the standard deviation of the project? (3 points)
What is the range of the duration of the project given 3 sigma? (3 points)
A project has four major activities. Activity A precedes activity B, activity C
precedes activity D. 3-point estimates for activities are A(4, 8, 12 ), B( 3, 6,
9 ), C( 1, 2, 3 ), D( 6, 12, 18 ) weeks. What probability would you assign to
a project duration of more than 14 weeks?
O a. 0.402
O b. 0.949
O c. 0.75
O d. 0.5
Chapter 19 Solutions
Operations Management
Ch. 19 - A project has four activities that take 4, 3, 6,...Ch. 19 - Consider the simple dependency matrix shown in...Ch. 19 - Consider a project with two activities that are...Ch. 19 - Prob. 4CQCh. 19 - Prob. 5CQCh. 19 - Prob. 6CQCh. 19 - Prob. 7CQCh. 19 - Prob. 8CQCh. 19 - Prob. 9CQCh. 19 - Prob. 10CQ
Ch. 19 - Consider two projects that have the same...Ch. 19 - Prob. 12CQCh. 19 - Prob. 13CQCh. 19 - Prob. 14CQCh. 19 - The key objectives of a project are given by a....Ch. 19 - Which of the following descriptions best captures...Ch. 19 - Prob. 1PACh. 19 - Prob. 2PACh. 19 - Prob. 3PACh. 19 - Prob. 4PACh. 19 - A project activity has an earliest completion time...Ch. 19 - What is the definition of the latest completion...Ch. 19 - Which of the following statements is correct with...Ch. 19 - A project consists of three tasks: A, B, and C....Ch. 19 - Prob. 9PACh. 19 - Prob. 10PACh. 19 - You manage a project with 10 activities....Ch. 19 - Which of the following activities is not part of...Ch. 19 - You have been asked by the CEO of your company to...Ch. 19 - BUILDING A HOUSE IN THREE HOURS Habitat for...Ch. 19 - BUILDING A HOUSE IN THREE HOURS Habitat for...
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- A project has 92 activities, but only 13 of them are analyzed here. Activity P, 9 days, IP = not given Activity W, 10 days, IP = not given Activity S, 6 days, IP = not given Activity A, 25 days, IP = P, W Activity F, 24 days, IP W, S Activity N, 21 days, IP S Activity E, 28 days, IP = A Activity M, 13 days, IP A, F Activity B, 40 days, IP N Activity H, 10 days, IP = E, M Activity K, 14 days, IP = E, M, B Activity D, 11 days, IP = B Activity R, 10 days, IP = B It has been calculated that LS(K) = 118, LS(D) = 109, LS(H) = 124, LS(R) = 116. %3D %3! %3D What is LS(A)?arrow_forwardBased on the given scenario below, determine the common problems in project scheduling then explain howeach mistake can affect the project. 1. Client: “We want a completed project by next month.”You: “Can you give us some details about exactly what you need in the project deliverable?”Client: “You understand what we want. Just deliver that.” 2. You: “Ok, team. Phase 1 is due by next Monday. It is important. Let’s do it.” No further information. 3. You: “How long will it take to finish phase 1?”Team member: “I don’t know. Maybe 3 days.”You: “Sounds good!” 4. Client: “I know you said you won’t be done with this phase until Monday, but we really need it byThursday. What do you have to do to get it to us by then?”You (checking plan which shows this is impossible): “I really don’t think we can do that”Client: “Just get it done.”You: “Ok”. 5. Client: “When will the project be done?”You: “If everything goes according to plan, we will have the project complete in 3 weeks. So…3 weeks.” 6.…arrow_forwardWhich of the following would NOT be considered in deciding how far to crash a project? Project overrun penalties. Incentives for early completion. Indirect project costs (e.g. interest on a construction loan). The normal duration times of tasks are not on a critical path. How far individual tasks can be crashed.arrow_forward
- What is the definition of the latest completion time (LCT) of a project activity?a. LCT(Ai) = Max{LST(Aj) for which Ajis a successor of Ai}b. LCT(Ai) = Min{LST(Aj) for which Ajis a successor of Ai}c. LCT(Ai) = Max{LST(Aj) for which Ajis a predecessor of Ai}d. LCT(Ai) = Min{LST(Aj) for which Ajis a predecessor of Ai}arrow_forwardWhich of the following best describes a task on the critical path? Select one: a. The task with the highest planned value b. The task with the highest actual cost c. The task with the longest duration d. The task with no slackarrow_forward18 Select the correct answer. Paul is the CEO of a mid-sized IT firm. Three weeks ago, he started a new project in his company. Soon after, Paul planned, scheduled, and assigned necessary tasks to his project team members. This week, the employees have started performing the tasks according to the instructions given to them on a trial. Which phase in the task lifecycle would Paul carry out next? OA. planning OB. reporting tracking testing OE. organizing Reset Next served. 99+arrow_forward
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