Quick Answer
The answer is 6.67 days. This is calculated using the three-point estimating PERT formula, which is (Optimistic + 4 × Most Likely + Pessimistic) / 6, giving more weight to the most likely estimate to account for uncertainty in task duration. For the given values of 4, 6, and 12 days, the math works out to (4 + 24 + 12) / 6 = 40 / 6, yielding 6.67 days. On the CompTIA Project+ PK0-005 exam, this tests your ability to apply the PERT expected duration formula in a straightforward calculation scenario, often appearing as a drag-and-drop or multiple-choice question where a common trap is to mistakenly use a simple average instead of the weighted formula. A helpful memory tip is to remember the phrase “O + 4M + P over 6” — think of it as giving the “most likely” estimate four times the influence because it’s the most realistic guess.
This PK0-005 practice question tests your understanding of project management concepts. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A project team is estimating the duration of a task. The optimistic estimate is 4 days, the pessimistic is 12 days, and the most likely is 6 days. Using the three-point estimating technique (PERT), what is the expected duration?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
7.33 days
Why wrong: This is the simple average of 4,6,12.
8 days
Why wrong: This is the average of O and P only.
6.67 days
Using PERT formula: (O + 4M + P)/6 = (4+24+12)/6 = 40/6 ≈ 6.67.
6 days
Why wrong: This is just the most likely estimate.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
6.67 days
The PERT expected duration formula is (Optimistic + 4 × Most Likely + Pessimistic) / 6. Plugging in the values: (4 + 4×6 + 12) / 6 = (4 + 24 + 12) / 6 = 40 / 6 = 6.67 days. This weighted average accounts for uncertainty by giving more weight to the most likely estimate.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
7.33 days
Why it's wrong here
This is the simple average of 4,6,12.
8 days
Why it's wrong here
This is the average of O and P only.
6.67 days
Why this is correct
Using PERT formula: (O + 4M + P)/6 = (4+24+12)/6 = 40/6 ≈ 6.67.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
6 days
Why it's wrong here
This is just the most likely estimate.
Common exam traps
The trap here is that candidates often mistakenly use a simple average or the midpoint of the range instead of the weighted PERT formula, leading to incorrect answers like 7.33 or 8 days.
Detailed technical explanation
The PERT formula derives from the Beta distribution, which models task durations with a skewed probability curve. In practice, this technique is used in project management to account for uncertainty, especially when historical data is scarce. The weighting (4×ML) reflects that the most likely duration is the mode of the distribution, while the optimistic and pessimistic estimates define the tails.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the PK0-005 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Project Management Concepts — study guide chapter
Learn the concepts, then practise the questions
Project Management Concepts practice questions
Targeted practice on this topic area only
All PK0-005 questions
500 questions across all exam domains
CompTIA Project+ PK0-005 study guide
Full concept coverage aligned to exam objectives
PK0-005 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise PK0-005 questions linked to Project Life Cycle Phases.
Practise PK0-005 questions linked to Basics of IT Infrastructure and IT Project Management.
Practise PK0-005 questions linked to Project Management Concepts.
Practise PK0-005 questions linked to Tools and Documentation.
Practise PK0-005 questions linked to PK0-005 fundamentals.
Practise PK0-005 questions linked to PK0-005 scenario.
Practise PK0-005 questions linked to PK0-005 troubleshooting.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Project Management Concepts — This question tests Project Management Concepts — Read the scenario before looking for a memorised answer..
The correct answer is: 6.67 days — The PERT expected duration formula is (Optimistic + 4 × Most Likely + Pessimistic) / 6. Plugging in the values: (4 + 4×6 + 12) / 6 = (4 + 24 + 12) / 6 = 40 / 6 = 6.67 days. This weighted average accounts for uncertainty by giving more weight to the most likely estimate.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 24, 2026
This PK0-005 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PK0-005 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.