Operations Management: Processes and Supply Chains (12th Edition) (What's New in Operations Management)
12th Edition
ISBN: 9780134741062
Author: Lee J. Krajewski, Manoj K. Malhotra, Larry P. Ritzman
Publisher: PEARSON
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Chapter 7, Problem 20P
Jordanne King, the project manager for Webjets International, Inc., compiled a table showing time estimates for each of the activities of a project to upgrade the company’s Web page, including optimistic, most likely, and pessimistic.
- Calculate the expected time,
- Calculate the variance,
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Jordanne King, the project manager for Webjets International, Inc., compiled a table showing time estimates for each of the activities of a project to upgrade the company’s Web page, including optimistic, most likely, and pessimistic.a. Calculate the expected time, te, for each activity.b. Calculate the variance, s2, for each activity.Activity Optimistic (days) Most Likely (days) Pessimistic (days)A 3 8 19B 12 15 18C 2 6 16D 4 9 20E 1 4 7
11-23 Tom Schriber, the director of personnel of Manage-ment Resources, Inc., is in the process of designing a
program that its customers can use in the job-findingprocess. Some of the activities include preparingresumés, writing letters, making appointments to seeprospective employers, and researching companiesand industries. The information on these activities isshown in the following table:
(d) Determine the critical path(s) and project com-pletion time.
(e) Determine the probability that the project willbe finished in 70 days or less.(f) Determine the probability that the project willbe finished in 80 days or less.
Recently, you were assigned to manage a project to remodelthe seminar room for your company. You have constructed anetwork diagram depicting the various activities in the project(Figure 7.13). In addition, you have asked your team to estimatethe amount of time that they would expect each of the activitiesto take. Their responses are shown in the following table:
a. What is the expected completion time of the project?b. What is the probability of completing the project in 21 days?c. What is the probability of completing the project in 17 days?
Chapter 7 Solutions
Operations Management: Processes and Supply Chains (12th Edition) (What's New in Operations Management)
Ch. 7 - One of your colleagues comments that software is...Ch. 7 - Explain how to determine the slack for each...Ch. 7 - Define risk as it applies to projects. What are...Ch. 7 - Consider the following data for a project to...Ch. 7 - The following information is known about a project...Ch. 7 - A project for improving a billing process has the...Ch. 7 - Prob. 4PCh. 7 - Prob. 5PCh. 7 - Consider the following information for a project...Ch. 7 - Consider the following data for a project to...
Ch. 7 - Paul Silver, owner of Sculptures International,...Ch. 7 - Prob. 9PCh. 7 - The following information concerns a project to...Ch. 7 - Consider a project to produce custom door moldings...Ch. 7 - Table 7.5 contains information about au...Ch. 7 - The Advanced Tech Company has a project to design...Ch. 7 - Prob. 14PCh. 7 - Table 7.8 contains data for the installation of...Ch. 7 - The diagram in Figure 7.12 was developed for the...Ch. 7 - Prob. 17PCh. 7 - Prob. 18PCh. 7 - You are the project manager of the software...Ch. 7 - Jordanne King, the project manager for Webjets...Ch. 7 - Recently, you were assigned to manage a project to...Ch. 7 - In Solved Problem 2, estimate the probability that...Ch. 7 - The director of continuing education at Bluebird...Ch. 7 - Gabrielle Kramer, owner of Pet Paradise, is...Ch. 7 - The project manager of Good Public Relations...Ch. 7 - Consider the office renovation project data in...Ch. 7 - Activity B and activity K are critical activities....Ch. 7 - Prob. 2AMECh. 7 - Prob. 3AMECh. 7 - Prob. 4AMECh. 7 - Prob. 5AMECh. 7 - Assess the four categories of a risk-management...Ch. 7 - Prob. 2VCCh. 7 - Assume you are Denise Tower and have...Ch. 7 - Prob. 1CCh. 7 - Prob. 2CCh. 7 - Prob. 3CCh. 7 - Prob. 4C
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- The project manager of Good Public Relations gathered the data shown in Table 7.15 for a new advertising campaign.a. How long is the project likely to take?b. What is the probability that the project will take more than 38 weeks?c. Consider the path A–E–G–H–J. What is the probability that this path will exceed 38 weeks?arrow_forwardFor the next project: | | TIME ESTIMATE (WEEKS) TASK DESCRIPTION a m b A foundations 2 3 4 B framework 4 7.5 8 C roofs 3 5.5 11 D plumbing 2.5 4 5.5 E electrical wiring 2 3 4 F doors and windows 3 5 7 G interior finish 3 3.5 7 H exterior finish 2 5 8 I inspection 1 1 1 a. I made the network diagram. b. Calculate the parameters corresponding to expected time, variance, nearest and farthest start times and farthest c. What is the probability of meeting a specific project completion date? For example, what is the probability of building the house in 32 weeks? Topic: stochastic processesarrow_forwardUsing the below table calculate critical path for the project. Which tasks are on the critical path? Task Predecessor Duration (Weeks) A - 32 B - 11 C - 12 D B,C 16 E A,B 23 F A 23 G D 22 H D 33arrow_forward
- Gabrielle Kramer, owner of Pet Paradise, is opening a new store in Columbus, Ohio. Her major concern is the hiring of a manager and several associates who are animal lovers. She also has to coordinate the renovation of a building that was previously owned by a chic clothing store. Kramer has gathered the data shown in Table 7.14.a. How long is the project expected to take?b. Suppose that Kramer has a personal goal of completing the project in 14 weeks. What is the probability that it will happen this quickly?arrow_forwardSsus and the management at yankee ltd. Want an expected time and variance for pest control activity and for that optimistic time was 2 weeks , pessimistic time was 8 weeks and most likely time is 4 weeks ?arrow_forwardGeneral Foundry’s project crashing data are shown below. Crash this project to 13 weeks using CPM. What is the final time for each activity after crashing? What is the crash cost per week per activity and the total cost of crashing? TIME (WEEKS) COST ($) ACTIVITY IMMEDIATE PREDECESSORS NORMAL CRASH NORMAL CRASH A — 2 1 22,000 23,000 B — 3 1 30,000 34,000 C A 2 1 26,000 27,000 D B 3 2 48,000 49,000 E C 4 2 56,000 58,000 F C 3 2 30,000 30,500 G D, E 5 2 80,000 83,000 H F, G 2 1 16,000 19,000arrow_forward
- Dave Fletcher was able to determine the activity times for constructing his laser scanning machine. Fletcher would like to determine ES, EF, LS, LF, and slack for each activity. The total project completion time and the critical path should also be determined. Here are the activity times: Activity Time (weeks) Immediate Predecessor(s) Activity Time (weeks) Immediate Predecessor(s) A 7 − E 4 B B 6 − F 5 B C 4 A G 10 C, E D 2 A H 8 D , F Part 2 Dave's earliest start (ES) and earliest finish (EF) are: Part 3 Part 4 Part 5 Part 6 Part 7 Part 8 Part 9 Part 10 Dave's latest start (LS) and latest finish (LF) are:…arrow_forwardGabrielle Kramer, owner of Pet Paradise, is opening a new store in Columbus, Ohio. Her major concern is the hiring of a manager and several associates who are animal lovers. She also has to coordinate the renovation of a building that was previously owned by a chic clothing store. Kramer has gathered the data shown in Table.a. How long is the project expected to take?b. Suppose that Kramer has a personal goal of completing the project in 14 weeks. What is the probability that it will happen this quickly?arrow_forwardUsing the following project information Activity Optimistic TimeEstimate(weeks) Most Likely TimeEstimates (weeks) Pessimistic TimeEstimates (weeks) ImmediatePredecessor(s) A 2 3 5 none B 2.6 4 5 A C 5 7 8 A D 3 5 7 B, C E 4 7 14 B, C F 2 5 8 D G 4 5 6 E H 6 6 7 F I 4 7 10 G J 2 3 3 H, I The critical path is A-C-E-G-I-J. Activity A B C D E F G H I J Variance 0.25 0.16 0.25 0.44 2.78 1.00 0.11 0.03 1.00 0.03 (a) Calculate the probability that the project will be completed in 31 weeks. (Round your answer to 4 decimal places, e.g. 1.7945.) P(project ≤ 31) = enter a probability (b) Calculate the probability that the project will be completed in 35 weeks. (Round your answer to 4 decimal places, e.g. 1.7945.) P(project ≤ 35) = enter a probabilityarrow_forward
- The Scott Corey accounting firm is installing a new computer system. Several things must be done to make sure the system works properly before all the accounts are put into the new system. The following table provides information about this project. How long will it take to install the system? What is the critical path? Activity Immediate Predecessor(s) Time (weeks) A 3 B 4 C A 6 D B 3 E A 5 F C 2 G D,E 5 H F,G 5 The managing partner of the Scott Corey accounting firm has decided that the system must be up and running in 16 weeks. Consequently, information about crashing the project was put together and is shown in the following table: Activity Immediate Predecessor(s) Normal Time (weeks) Crash Time (weeks) Normal Cost ($) Crash Cost ($) A 3 2 8,000 9,300 B 4 3 9,000 10,000 C A 6 4 12,000 15,000 D B 3 1 15,000 15,500 E A 5 3 5,000…arrow_forwardGlen Halford has laid out the major steps involved in the engine assembly process for an experimental automobile. the activities are labeled A through D in the following table, which also shows thier project is shown below. Immediate Time Estimates(weeks) Activity Predecessor(s) Optimistic(a) Most Likely(m) Pessimistic(b) A - 4 6 8 B - 8 10 12 C B 16 18 20 D A,C 8 10 24 Start-----A---------------------------D ------B------------C---------------D a.For each activity,copute the expected completion time and thevariance of the completion time. the expected completion time : t =(a+4m+b)/6 the variance of the completion:…arrow_forwardDraw a network diagram showing the linkage between these activities from start to finish. For the diagram, each activity should be labelled alphabetically ie. A, B, C… etc. PERT Formula: TE = (O + 4T + P) / 6 TE = Pert Expected Time Duration, O = Optimistic estimate, P = Pessimistic estimate, T = Most Likely (Typical) estimate Activity Predecessor Optimistic Most Likely Pessimistic Duration Duration in Weeks A — 2 3 4 B — 4 5 7 C B 1 2 3 D C & E 0.5 1 1.5 E B 0.5 1 1.5 F C 2 3 4 G F 2 3 4arrow_forward
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