Lean Six Sigma Black Belt Practice Exam — All Questions

A process produces 15 defects across 300 units, each with 5 defect opportunities. What is the DPMO?

• a.5,000
• b.50,000
• c.10,000✓
• d.1,500

DPMO = 15 / (300 x 5) x 1,000,000 = 15/1500 x 1,000,000 = 10,000.

Approximately how many DPMO corresponds to a 3-sigma process (with the 1.5-sigma shift)?

• a.About 66,807✓
• b.About 233
• c.About 6,210
• d.About 3.4

A 3-sigma process is roughly 66,807 DPMO; 6 sigma is 3.4 DPMO.

Gage R&R (a Measurement System Analysis) assesses:

• a.The control plan
• b.Project ROI
• c.Customer satisfaction
• d.Repeatability and reproducibility of the measurement system✓

Gage R&R quantifies measurement variation from equipment (repeatability) and appraisers (reproducibility).

A process has USL 110, LSL 90, and a standard deviation of 2.5 (centered). What is Cp?

• a.0.67
• b.1.00
• c.1.33✓
• d.2.00

Cp = (USL - LSL) / (6 x sigma) = 20 / 15 = 1.33.