Question: An activity in a network diagram has an optimistic time estimate of 7 days, a most likely time estimate of 11 days, and a pessimistic

An activity in a network diagram has an optimistic time estimate of 7 days, a most likely time estimate of 11 days, and a pessimistic time estimate of 19 days. Its variance is _________.

a. 6

b. 2

c. 4

d. 12

e. 24

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