Question: Hey, I do not know how to do this, what's the equation? A PERT project has 45 activities, 19 of which are on the critical

Hey, I do not know how to do this, what's the equation?

A PERT project has 45 activities, 19 of which are on the critical path. The

estimated time for the critical path is 120 days. The sum of all activity

variances is 64, while the sum of variances along the critical path is 36.

The probability that the project can be completed between days 108 and

120 is

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