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

Answer 1

Answer:

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:

C. 9.

Explanation:

The implication is that the standard deviation of the critical path is the sum of the standard deviations of the four activities on the critical path.  This sums to 9 days (1 + 2 + 4 + 2), implying that the critical path varies from the mean days of critical path activities by 9 days plus or minus.