An activity has an optimistic time estimate of 15 days,a most likely estimate of 24 days,and a pessimistic estimate of 40 days.What is the variance of the activity?
A)4.17
B)25.17
C)17.36
D)10.33

Question

Quizplus · Accepted Answer

The variance can be calculated using the following formula:
Variance = (Pessimistic estimate - Optimistic estimate)^2 / 6
Variance = (40-15)^2 / 6 = 437.5 / 6 = 72.92
Therefore, the variance is 72.92 days. 
The closest option is C (17.36), which is the square root of the variance.

An Activity Has an Optimistic Time Estimate of 15 Days,a