What is the expected time for activity c? A. 5.167 B. 3 C. 4.28 D. 6 I think D is the correct answer What is the variance for activity A?

What is the expected time for activity c?
A.   5.167
B.   3
C.   4.28
D.   6
I think D is the correct answer
What is the variance for activity A?
A.   3.33
B.   2.77
C.   5.31
D.   .674
Is C the correct answer
Assume there is one critical path of (A, B, C, E) what is the project variance?
A.   5.583
B.   6.313
C.   7.421
D.   8.667
??? not sure here
 
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