There are four activities on the critical path. Coincidentally, their standard deviations are all equal to 4. The standard deviation of the critical path is therefore equal to
A)2.
B)4.
C)8.
D)16.
E)64.

Question

Quizplus · Accepted Answer

The standard deviation of the critical path is the square root of the sum of the variances of the activities on the path. Since each activity has a standard deviation of 4, the variance for each is 16 (4^2). With four activities, the total variance is 64 (4*16), and the standard deviation is the square root of 64, which is 8.

There Are Four Activities on the Critical Path