Table 1: Activities and Predecessors Activity Immediate Predecessors Duration A 7 B A 6 C A D В.С 12 E B,C 14 F D,E 5

Practical Management Science
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Author:WINSTON, Wayne L.
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Chapter2: Introduction To Spreadsheet Modeling
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Consider a project that has been modeled as in Table 1

  1. Draw the PERT/CPM network for this project and determine the project’s expected completion time µP and its critical path. 
  2. Suppose the standard deviations of the activity durations are σA = 2, σB = 1, σC = 0, σD = 2, σE = 3, and σF = 0. Then please estimate the standard deviation of the overall project’s standard deviation σP . 
  3. Suppose for the standard Normal random variable Z, we know P[−1 ≤ Z ≤ +1] ' 68%, P[−2 ≤ Z ≤ +2] ' 95%, and P[−3 ≤ Z ≤ +3] ' 99.7%. Then, approximately what time T is one for which there is only a less than 2.5% chance for the completion time to beat (be shorter than)?
Table 1: Activities and Predecessors
Activity Immediate Predecessors Duration
A
7
В
A
C
A
3
B,C
12
E
B,C
14
F
D,E
5
Transcribed Image Text:Table 1: Activities and Predecessors Activity Immediate Predecessors Duration A 7 В A C A 3 B,C 12 E B,C 14 F D,E 5
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