Question: A PERT network has three activities on critical path with mean time 3, 8 and 6 and standard deviation 1, 2 and 2 respectively. The

A PERT network has three activities on critical path with mean time 3, 8 and 6 and standard deviation 1, 2 and 2 respectively. The probability that the project will be completed in 20 days is

0.5, 0.66, 0.84, 0.94

Do with manual process. Don't use excel.

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