IASSC Certified Lean Six Sigma Black Belt (ICBB) — Question 13

What is the Ppk of a process with a spread of 24 units, an average of 68, an upper limit of 82 and a lower limit of 54?

Answer options

• A. 1.68
• B. 2.00
• C. 4.00
• D. 4.42

Correct answer: C

Explanation

The correct Ppk value is calculated by determining the distance from the mean to the closest specification limit, which in this case results in a Ppk of 4.00. Options A and B are incorrect as they do not reflect the correct calculation of Ppk, and option D exceeds the calculated value based on the given data.