Question: How do I calculate what the expected and variance will be on this chart? ACTIVITY PRECEEDED BY FOLLOWED BY OPTIMISTIC MOST LIKELY PESSIMISTIC EXPECTED VARIANCE

How do I calculate what the expected and variance will be on this chart?

ACTIVITY PRECEEDED BY FOLLOWED BY OPTIMISTIC MOST LIKELY PESSIMISTIC EXPECTED VARIANCE
A -- B, C 1 2 3
B A D 1 3 5
C A F 2 4 6
D B E 2 4 5
E D G 2 3 4
F C H 3 5 6
G E H 1 2 3
H F, G -- 2 3 4

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