ExpertHard1 markShort Answer
PMP · Question 25 · Task 6: Plan and manage schedule
A project has a three-point estimate for a critical path activity:<br/>- Optimistic (O): 8 days<br/>- Most Likely (M): 12 days<br/>- Pessimistic (P): 22 days<br/><br/>Using the PERT formula, calculate the expected duration for this activity. Round to one decimal place and enter numbers only (e.g., 12.5).
A project has a three-point estimate for a critical path activity:<br/>- Optimistic (O): 8 days<br/>- Most Likely (M): 12 days<br/>- Pessimistic (P): 22 days<br/><br/>Using the PERT formula, calculate the expected duration for this activity. Round to one decimal place and enter numbers only (e.g., 12.5).
How to approach this question
Use the PERT formula: Expected Duration = (O + 4M + P) / 6. Substitute the values and calculate.
Full Answer
PERT expected duration = (O + 4M + P) / 6 = (8 + 4×12 + 22) / 6 = (8 + 48 + 22) / 6 = 78 / 6 = 13.0 days.
Common mistakes
Using simple average (O + M + P) / 3 instead of the weighted PERT formula, or calculation errors in the arithmetic.
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