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Project Management Professional · PMI
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- Using the PERT formula: tE = (tO + 4tM + tP) / 6 = (4 + 4(7) + 16) / 6 = (4 + 28 + 16) / 6 = 48/6 = 8 days. The PERT formula gives the most weight to the most likely estimate (4x) while accounting for optimistic and pessimistic scenarios, producing a weighted average that is more reliable than a single-point estimate.