Asq Certified Quality Auditor CQA · Free Practice Question Medium
Question 23
A process has a process mean (µ) of 50, a standard deviation (σ) of 3, an upper specification limit (USL) of 62, and a lower specification limit (LSL) of 38. What is the process performance index (Cpk)?
- A 1.5
- B 1.67
- C 1
- D 1.33
Reveal correct answer
Correct answer: D
Explanation
Cpk = min[(USL - µ) / (3σ), (µ - LSL) / (3σ)]
= min[(62 - 50) / (3 × 3), (50 - 38) / (3 × 3)]
= min[12 / 9, 12 / 9] ≈ 1.33
Discussion
Think the marked answer is wrong, or have a better explanation? Share it below — comments appear after review.
You must be logged in to post a comment.
