WD_HW1_2011(1)

# WD_HW1_2011(1) - must “wait” until activity A is...

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540:201 Work Design and Ergonomics HW #1 REVISED DUE DATE: Monday, October 10, 2011 Chapter 1: Problem #2; Extra Credit: Chapter 1, Problem #5 Chapter 8: Problem #1; Extra Credit: Chapter 8, Problem #5 Chapter 9: Extra Credit: Chapter 9, Problems #4, #5 Chapter 7: Problems #1, #4, #8 (use Activity on the Arrow), #11 (use Activity on the Arrow) Additional Required Problem for Chapter 7 A project has the following activities. The activities with their duration times are as follows: Activity Expected Time (weeks) A (1,2) 8 B (1,3) 10 C (1,4) 7 D (2,5) 6 E (3,4) 2 F (3,5) 8 G (4,6) 3 H (5,7) 7 I (6,7) 10 The notation (i,j) means “from node i to node j” (e.g., Activity “A” occurs on the arrow from node 1 to node 2). Based on the project manager’s discretion, it has been established that activities F and E
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Unformatted text preview: must “wait” until activity A is completed. Similarly, activity I must “wait” until activity B is completed. Determine : (a) The project network, the project time, and the critical path(s). (b) Can activity F be delayed without delaying the entire project? If so, by how many weeks? (c) Can activity D be delayed without delaying the entire project? If so, by how many weeks? (d) Using the Earliest Start Time, construct a Gantt Chart for this project. (e) If you know that the variance of a PERT activity is 4.00 weeks, and the most likely time is one less than the expected time of 25 weeks, what are t o , t m , and t p ? (f) Based on (e), what is the probability of completing this project by 25 weeks or less? (g) Based on (e), what is the probability of completing this project in exactly 25 weeks?...
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