A PERT network has 9 activities on its critical path. The standard deviation of each activity on the critical path is 3. The standard deviation of the critical path is

A PERT network has 9 activities on its critical path. The standard dev

1.	A PERT network has 9 activities on its critical path. The standard deviation of each activity on the critical path is 3. The standard deviation of the critical path is
A.	3
B.	9
C.	81
D.	27
Answer» C. 81