CMA Intermediate · Operations Management and Strategic Management · Project Management, Monitoring and Control
An activity has optimistic time 6 days, most likely time 9 days and pessimistic time 18 days. What is the variance of its duration under PERT?
The variance is 4. PERT variance equals the square of one-sixth of the range, so ((18 − 6)/6)² = 2² = 4. The value 2 is the standard deviation, not the variance.
- A4Correct
- B2
- C12
- D1
Explanation
Variance = ((b - a)/6)^2 = ((18 - 6)/6)^2 = 2^2 = 4. Option 2 is the standard deviation, which is a common slip of not squaring it.
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