ASQ Certified Manager of Quality / Organizational Excellence (CMQ/OE) — Question 14

What percentage of a process will fall within ±3σ when the process has a normal curve?

Answer options

• A. 95.46
• B. 98.75
• C. 99.73
• D. 99.98

Correct answer: A

Explanation

The correct answer is A, as approximately 95.46% of data in a normal distribution falls within ±3σ. Options B, C, and D represent percentages that correspond to ±2σ, ±3.5σ, and ±4σ respectively, which do not apply to the question regarding ±3σ.