Question: An activity on a PERT network has these time estimates: optimistic = 3, most likely = 5, and pessimistic = 9. Its expected time and

An activity on a PERT network has these time estimates: optimistic = 3, most likely = 5, and pessimistic = 9. Its expected time and variance (if it is a critical activity) are

A. 4.3; 1.5.
B. 3.6; 0.8.
C. 2.5; 1.4.
D. 5.3; 1.
E. 3.3; 0.5.

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