Question: A PERT diagram is shown below with the optimistic, most likely, and pessimistic times, in days, shown above each arrow. Please find the expected completion

A PERT diagram is shown below with the optimistic, most likely, and pessimistic times, in days, shown above each arrow. Please find the expected completion time and find the critical path. Then, find the standard deviation of the critical path, and figure out the probability of completing the critical path in 2 days less than the expected duration.

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