Schedule · PM Glossary

Standard Deviation

A measure of how spread out values are around the average. In PERT, the standard deviation of an activity is (P − O) ÷ 6.

Example

With O = 4 and P = 16 days, σ = (16 − 4) ÷ 6 = 2 days, so about 68% of outcomes fall within ±2 days of the mean.

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Standard Deviation

Example

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