In a PERT analysis, an activity has
Using the standard PERT formula for standard deviation, what is the activity's standard deviation in days?
2.5 days
2 days
3 days
12 days
The PERT standard deviation (σ) measures the spread between optimistic and pessimistic outcomes and is calculated as:
σ = (P − O) / 6
σ = (25 − 13) / 6 = 12 / 6 = 2 days.
Therefore, 2 days is the correct value; the other options reflect either forgetting to divide by 6 (12 days) or using arbitrary divisors (2.5 days and 3 days).
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