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PMI Project Management Professional Practice Question

A project manager is estimating the duration of a task using PERT. The optimistic estimate for the task is 8 days, the most likely estimate is 12 days, and the pessimistic estimate is 20 days. What is the standard deviation of the task's duration?

2 days
4 days
6 days
8 days

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Answer Description

Standard deviation (σ) measures the amount of variation or dispersion of a set of values. In PERT, it is calculated with the formula σ = (Pessimistic - Optimistic) / 6. For this task, the pessimistic estimate is 20 days and the optimistic estimate is 8 days. Thus, the calculation is (20 - 8) / 6 = 2. Since other answers may be derived from different interpretations or calculations, it is important to apply the correct formula.

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