ExpertHard1 markShort Answer
Task 6: Plan and manage schedulepert-estimationthree-point-estimationschedule-calculationexpected-duration
PMP · Question 56 · Task 6: Plan and manage schedule
A project has the following three-point estimates for a critical activity:<br/><br/>Optimistic (O): 8 days<br/>Most Likely (M): 12 days<br/>Pessimistic (P): 22 days<br/><br/>Using the PERT formula, what is the expected duration for this activity? (Round to one decimal place, enter numbers only)
A project has the following three-point estimates for a critical activity:<br/><br/>Optimistic (O): 8 days<br/>Most Likely (M): 12 days<br/>Pessimistic (P): 22 days<br/><br/>Using the PERT formula, what is the expected duration for this activity? (Round to one decimal place, enter numbers only)
How to approach this question
Use the PERT formula: Expected Duration = (O + 4M + P) / 6. Calculate: (8 + 4(12) + 22) / 6 = (8 + 48 + 22) / 6 = 78 / 6 = 13.0 days.
Full Answer
13.0
PERT three-point estimation uses the formula (O + 4M + P) / 6 to calculate expected duration. This weights the most likely estimate more heavily: (8 + 4×12 + 22) / 6 = 78 / 6 = 13.0 days.
Common mistakes
Using simple average instead of PERT formula, calculation errors, or incorrect formula application.
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