PK0-005 Project Life Cycle Practice Question
A project has a critical path duration of 45 days. Activity X on the critical path has an optimistic duration of 5 days, a pessimistic duration of 13 days, and a most likely duration of 8 days. What is the expected duration of activity X using PERT?
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
✓
8.33 days
PERT expected duration = (Optimistic + 4*Most Likely + Pessimistic) / 6 = (5 + 4*8 + 13)/6 = (5+32+13)/6 = 50/6 ≈ 8.33 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.
- ✗
8.0 days
Why it's wrong here
That is the most likely, not the expected.
- ✓
8.33 days
Why this is correct
Correct PERT calculation.
- ✗
7.5 days
Why it's wrong here
This is incorrect calculation.
- ✗
9.0 days
Why it's wrong here
This is incorrect.
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