Question: An activity on a PERT network has these time estimates: optimistic = 1, most likely = 2, and pessimistic = 5. What is the variance

An activity on a PERT network has these time estimates: optimistic = 1, most likely = 2, and pessimistic = 5. What is the variance of activity completion time? Group of answer choices 0.44 0.83 1.67 2.50 3.00

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