PK0-005 Tools and Documentation Practice Question
A project manager creates a visual representation that shows the 20% of causes contributing to 80% of the problems in a project. Which tool is being used?
⚠ Common exam trap
PK0-005 often tests the confusion between quality management tools, particularly the Pareto chart and histogram, because both use bars; the trap is forgetting that only the Pareto chart orders bars by frequency and includes a cumulative percentage line to highlight the 80/20 principle.
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
✓
Pareto chart
The Pareto chart is a specific type of bar chart that orders categories by frequency or impact, visually highlighting the 80/20 principle—the idea that roughly 80% of problems stem from 20% of causes. By arranging bars in descending order and often including a cumulative percentage line, it directs attention to the vital few issues that yield the greatest improvement. This matches the project manager's goal of identifying the 20% of causes responsible for 80% of problems.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Control chart
Why it's wrong here
A control chart plots process measurements over time against statistical control limits to separate common from special-cause variation. It is tempting because it visualises quality data, and would be correct for detecting whether a process is stable, but it cannot rank causes by frequency, which is what the 80/20 statement describes.
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Scatter diagram
Why it's wrong here
A scatter diagram plots paired values of two variables to reveal correlation between them. It is tempting because it is a quality tool that exposes relationships, and would be correct for testing whether one measurement influences another, but the stem describes ranked causes by share of problems, not correlation between two variables.
- ✓
Pareto chart
Why this is correct
A Pareto chart combines a bar graph of causes ranked by frequency with a cumulative line, applying the 80/20 principle. It isolates the vital few causes producing most problems, directly satisfying the stem's requirement to display the 20% of causes behind 80% of issues.
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Histogram
Why it's wrong here
A histogram groups continuous data into bins to show the frequency distribution of one variable. It is tempting because Pareto analysis also uses bars, and a histogram would be correct for assessing spread, shape or centring of measurements, but it does not sort categories by cumulative contribution, so the 20/80 split is not expressed.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
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.