PMI-RMP · Question #624
it typically takes 5 hours to perform a complete home inspection. If there are unforeseen risk factors, it can take up to 7 hours to finish the inspection. The earliest the project team has ever…
The correct answer is B. 5 hours. PERT (Program Evaluation and Review Technique) uses the weighted average formula: (Optimistic + 4 × Most Likely + Pessimistic) / 6. Plugging in the values: Optimistic (O) = 3 hours (earliest ever finished), Most Likely (M) = 5 hours (typical), Pessimistic (P) = 7 hours (with…
Question
it typically takes 5 hours to perform a complete home inspection. If there are unforeseen risk factors, it can take up to 7 hours to finish the inspection. The earliest the project team has ever finished an inspection is in 3 hours. Using the project evaluation and review technique (PERT) to estimate duration how many hours should the project manager plan to schedule the task taking into account all the positive and negative risk factors?
Options
- A4 hours
- B5 hours
- C6 hours
- D12 hours
How the community answered
(55 responses)- A7% (4)
- B76% (42)
- C13% (7)
- D4% (2)
Explanation
PERT (Program Evaluation and Review Technique) uses the weighted average formula: (Optimistic + 4 × Most Likely + Pessimistic) / 6. Plugging in the values: Optimistic (O) = 3 hours (earliest ever finished), Most Likely (M) = 5 hours (typical), Pessimistic (P) = 7 hours (with unforeseen risk factors). Calculation: (3 + 4×5 + 7) / 6 = (3 + 20 + 7) / 6 = 30 / 6 = 5 hours. The PERT formula gives heavy weight to the most likely estimate (multiplied by 4), so when all three values are symmetrically distributed around the most likely value, the result equals the most likely estimate.
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