There are four activities on the critical path,and the standard deviations for their durations are 1,2,4,and 2 days.The standard deviation of the duration of the critical path is:
A)3
B)5
C)9
D)16
E)25

Question

Quizplus · Accepted Answer

The standard deviation of the critical path can be calculated by taking the square root of the sum of the variances of the activities on the critical path. The variance of an activity is equal to the square of its standard deviation. Therefore, the variance of the critical path is 1^2+2^2+4^2+2^2=21. Taking the square root of 21 gives us approximately 4.58, which rounded to the nearest integer, is 5. Therefore, the standard deviation of the critical path is 5.

There Are Four Activities on the Critical Path,and the Standard