An activity has an optimistic time estimate of 12 days,a most likely estimate of 16 days,and a pessimistic estimate of 22 days.What is the expected standard deviation of the activity?
A)Between 1 and 2 days
B)Between 2 and 3 days
C)Between 3 and 4 days
D)Between 4 and 5 days

Question

Quizplus · Accepted Answer

The standard deviation for an activity in PERT is calculated as (Pessimistic - Optimistic) / 6. Here, it is (22 - 12) / 6 = 10 / 6 = 1.67 days, which falls between 1 and 2 days.

An Activity Has an Optimistic Time Estimate of 12 Days,a