What is the estimated standard deviation in the time for activity E?
A)2 days
B)3 days
C)4 days
D)16 days
E)24 days

Question

Quizplus · Accepted Answer

According to the PERT model, the estimated standard deviation (σ) in the time for an activity is calculated as (Optimistic time + 4 x Most likely time + Pessimistic Time)/6 - Optimistic time.

For activity E, the optimistic time is 6 days, the most likely time is 10 days, and the pessimistic time is 14 days.

Hence, σ = (6 + 4(10) + 14)/6 - 6 = 4 days.

Therefore, the best choice is C.

What Is the Estimated Standard Deviation in the Time for Activity