The standard deviation of a path is computed as:
A)the sum of the standard deviations of all activities on the path
B)the square root of the sum of the standard deviations of all activities on the path
C)the sum of the variances of all activities on the path
D)the square root of the sum of the variances of all activities on the path
E)None of the above

Question

The standard deviation of a path is computed as:
A)the sum of the standard deviations of all activities on the path 
B)the square root of the sum of the standard deviations of all activities on the path 
C)the sum of the variances of all activities on the path 
D)the square root of the sum of the variances of all activities on the path 
E)None of the above

Quizplus · Accepted Answer

The standard deviation of a path in a network diagram is computed as the square root of the sum of the variances of all activities on the path. This is because the variance measures the dispersion or spread of the activity duration, and taking the square root of the sum of variances gives the standard deviation, which is also a measure of dispersion or uncertainty in the path duration. Thus, option D is the correct answer.

The Standard Deviation of a Path Is Computed As