Free PMI Project Management Professional (PMP) 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?

  • 4 days

  • 2 days

  • 6 days

  • 8 days

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