nship in network below. The estimate (in weeks) of the duration of each activity is in the table below. a. The mean and variance of t

Practical Management Science
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Chapter2: Introduction To Spreadsheet Modeling
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A contractor needs to complete a project. The project involves 10 activities (labeled A, B, ..., J) with precedence relationship in network below. The estimate (in weeks) of the duration of each activity
is in the table below.

a. The mean and variance of the activity time for A~F are given in the table. Find the mean and variance of the activity time for the remaining arcs.
b. Identify the critical path and then compute the mean and variance of the project completion time.
c. What is the probability that the project is completed between 32 and 36 weeks?
d. What completion time should the contractor claims to be 95% sure of completing the project by then?

5
D
G
H
3
6
Activity
Optimistic
Most Likely 3
Pessimistic
ABCDEFG
0 13 3
3 3
12 13 3 9
3 4
HIJ
1 4 12 8 4 2
14 7
26 16 8
4
7 16 15
5
13 28 30
Мean
4
7 16
Variance
4
1
4
16
2.
Transcribed Image Text:5 D G H 3 6 Activity Optimistic Most Likely 3 Pessimistic ABCDEFG 0 13 3 3 3 12 13 3 9 3 4 HIJ 1 4 12 8 4 2 14 7 26 16 8 4 7 16 15 5 13 28 30 Мean 4 7 16 Variance 4 1 4 16 2.
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