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Certified Associate in Project Management · PMI
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- The PERT weighted average formula is: Expected Cost = (Optimistic + 4 x Most Likely + Pessimistic) / 6. Expected Cost = ($40,000 + 4 x $50,000 + $90,000) / 6 = ($40,000 + $200,000 + $90,000) / 6 = $330,000 / 6 = $55,000. The PERT formula gives four times the weight to the most likely estimate, reflecting that it is the most probable outcome.