When calculating the variance of an activity, the formula is σ2=b-a26 is the correct formula no matter what probability is used to estimate b and
a.

Question

Quizplus · Accepted Answer

The correct formula for calculating the variance of an activity in project management, specifically in the context of PERT (Program Evaluation and Review Technique), is σ² = ((b - a)/6)², where b is the pessimistic estimate, a is the optimistic estimate, and 6 represents the range of standard deviations covering approximately 99.7% of the distribution in a normal curve. The formula provided in the question is incorrect due to a typographical error.

When Calculating the Variance of an Activity, the Formula Is