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.
B)5.
C)9.
D)16.
E)25.

Question

Quizplus · Accepted Answer

The standard deviation of the critical path is calculated by taking the square root of the sum of the squares of the individual standard deviations. So, sqrt(1^2 + 2^2 + 4^2 + 2^2) = sqrt(1 + 4 + 16 + 4) = sqrt(25) = 5.

There Are Four Activities on the Critical Path, and They