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    PracticePMI PMP®PMI PMP Practice Exam 3Question 25
    Hard1 markShort Answer
    Task 6: Plan and manage schedulePERTthree-point estimationschedule managementexpected duration

    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).

    How to approach this question

    Use the PERT formula: Expected Duration = (O + 4M + P) / 6. Substitute the values and calculate.

    Full Answer

    13.0
    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.
    Question 24All questionsQuestion 26

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