GATE ME 2021 Set 2 — Question 18
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Industrial Engineering → Operations Research → PERT & CPM
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Question
A PERT network has 9 activities on its critical path. The standard deviation of each activity on the critical path is 3. The standard deviation of the critical path is
Correct answer
(B) 9
Solution
In a PERT network, the variance of the critical path is the sum of the variances of the individual activities on that path.
Given:
Number of activities on critical path,
Standard deviation of each activity,
Variance of each activity,
Variance of the critical path,
Standard deviation of the critical path, .
Given:
Number of activities on critical path,
Standard deviation of each activity,
Variance of each activity,
Variance of the critical path,
Standard deviation of the critical path, .
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