Operations Management
13th Edition
ISBN: 9780135173626
Author: HEIZER, Jay, RENDER, Barry, Munson, Chuck
Publisher: Pearson,
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Textbook Question
Chapter 3, Problem 20P
The estimated times and immediate predecessors for the activities in a project at Howard Umrah’s retinal scanning company are given in the following table. Assume that the activity times are independent.
- a. Calculate the expected time and variance for each activity.
- b. What is the expected completion time of the critical path? What is the expected completion time of the other path in the network?
- c. What is the variance of the critical path? What is the variance of the other path in the network?
- d. If the time to complete path A–C is
normally distributed , what is the probability that this path will be finished in 22 weeks or less? - e. If the time to complete path B–D is normally distributed, what is the probability that this path will be finished in 22 weeks or less?
- f. Explain why the probability that the critical path will be finished in 22 weeks or less is not necessarily the probability that the project will be finished in 22 weeks or less.
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View the video Noodles & Company (8.28minutes, Ctrl + Click on the link); what are your key takeaways (tie to one or more of the topics discussed in Chapters 7 & 7S – service process design, type of job design, methods analysis, work methods, job design, learning curve effect, etc.) after watching this video. https://media.gaspar.mheducation.com/GASPARPlayer/play.html?id=E5i8OKgpqhwywhgFmpp1bmM
Note: As a rough guideline, please try to keep the written submission to one or two paragraphs.
2) Leland, the job analyst at Zevo Toys, wanted to perform a time study on the assembling of toys. He observed one of the workers, Magorium, for five hours. During that time, Magorium assembled 250 toys. Leland rated Magorium as performing at 110 percent. The allowance for rest, personal time, etc. at Zevo Toys is 12 percent.
a) Compute the normal time for the job.
b) Compute the standard time for the job.
Note: You could work out the problem by hand or use excel; in chapter 7,…
1) Noodles & Company
View the video Noodles & Company (8.28minutes, Ctrl + Click on the link); what are your key takeaways (tie to one or more of the topics discussed in Chapters 7 & 7S – service process design, type of job design, methods analysis, work methods, job design, learning curve effect, etc.) after watching this video. https://media.gaspar.mheducation.com/GASPARPlayer/play.html?id=E5i8OKgpqhwywhgFmpp1bmM
Note: As a rough guideline, please try to keep the written submission to one or two paragraphs.
2) Leland, the job analyst at Zevo Toys, wanted to perform a time study on the assembling of toys. He observed one of the workers, Magorium, for five hours. During that time, Magorium assembled 250 toys. Leland rated Magorium as performing at 110 percent. The allowance for rest, personal time, etc. at Zevo Toys is 12 percent.
a) Compute the normal time for the job.
b) Compute the standard time for the job.
Note: You could work out the problem by hand or use…
Chapter 3 Solutions
Operations Management
Ch. 3 - Prob. 1EDCh. 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 - Prob. 20DQCh. 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 - Task time estimates for the modification of an...Ch. 3 - The activities needed to build a prototype laser...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 - 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 - Prob. 1PCh. 3 - Prob. 2PCh. 3 - Prob. 3PCh. 3 - Prob. 4PCh. 3 - Prob. 8PCh. 3 - Prob. 13PCh. 3 - Prob. 15PCh. 3 - Prob. 17PCh. 3 - Prob. 24PCh. 3 - Prob. 25PCh. 3 - Prob. 28PCh. 3 - Prob. 33PCh. 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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