Given an activity's optimistic, most likely, and pessimistic time estimates of 3, 6, and 9 days respectively, compute the PERT variance for this activity.

Question

Quizplus · Accepted Answer

The PERT variance ($σ^2$) for an activity is calculated using the formula $\frac{(Pessimistic - Optimistic)^2}{6^2}$, where the pessimistic time estimate is 9 days and the optimistic time estimate is 3 days. Substituting these values gives $\frac{(9-3)^2}{6^2} = \frac{36}{36} = 1$.

Given an Activity's Optimistic, Most Likely, and Pessimistic Time Estimates