IASSC Certified Lean Six Sigma Black Belt (ICBB) — Question 17

The reported Cpk for a process with an average of 98 units, a spread of 16 units and upper and lower specification limits of 115 and 90 units would be?

Answer options

• A. 0.5
• B. 0.75
• C. 1.00
• D. 1.25

Correct answer: C

Explanation

The Cpk is calculated using the formula Cpk = min (USL - mean) / (3 * sigma, mean - LSL) / (3 * sigma). In this case, the Cpk value is 1.00, indicating the process is capable of producing within the specification limits. The other options suggest lower capability which is not accurate given the provided data.