ASQ Certified Six Sigma Black Belt (CSSBB) — Question 10

Using this partial Z Table, how many units from a months production run are expected to not satisfy customer requirements for the following process?
Upper specification limit: 8.4 Lower specification limit: 4.7 Mean of the process: 6.2 Standard Deviation: 2.2 Monthly production: 360 units

Answer options

• A. 8
• B. 13
• C. 28
• D. 57

Correct answer: D

Explanation

The calculation of units not meeting specifications is based on the process mean and standard deviation in relation to the upper and lower specification limits. The correct answer, D (57), reflects the total units calculated to fall outside the specified limits, while answers A, B, and C do not account for the full range of defective units based on the given statistical parameters.