CAPM Practice Question: Project Management Fundamentals and Core Concepts
A project manager is estimating activity durations. The team provides three estimates: optimistic 10 days, pessimistic 20 days, most likely 14 days. Using the PERT beta distribution, what is the expected duration?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
14.33 days
PERT expected = (O + 4M + P)/6 = (10 + 4*14 + 20)/6 = (10 + 56 + 20)/6 = 86/6 = 14.33 days.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
14 days
Why it's wrong here
This is the most likely estimate, not the PERT expected.
- ✗
14.67 days
Why it's wrong here
This would be (O+M+P)/3 = 44/3 = 14.67, but PERT uses weighted average.
- ✗
15 days
Why it's wrong here
Incorrect calculation.
- ✓
14.33 days
Why this is correct
Correct calculation using the PERT formula.
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Written by Johnson Ajibi, MSc IT Security
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