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

Question

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

Quizplus · Accepted Answer

The standard deviation of a critical path is calculated by taking the square root of the sum of the variances of all the activities on the path. In this case, the sum of the variances is (1^2 + 2^2 + 4^2 + 2^2) = 21. Taking the square root of 21 gives us approximately 4.58, which rounded up to the nearest whole number is 5. Therefore, the standard deviation of the critical path is 5 days. The best choice is B.

There Are Four Activities on the Critical Path,and They Have