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PERT standard deviation

An activity has optimistic 4 days, most likely 7 days and pessimistic 16 days. Using PERT, what are the expected duration and standard deviation?

A.Expected 9 days, standard deviation 2 daysB.Expected 7 days, standard deviation 2 daysC.Expected 8 days, standard deviation 2 daysD.Expected 8 days, standard deviation 12 days

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PERT standard deviation

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