Another company makes 1,000,000 parts. They're a low cost provider, and thus they're shooting for 2 sigma quality. Fewer than ___ out of a million defective parts would be the threshold they are trying to beat.
A)47,000
B)45,400
C)4,540
D)4,700
E)450

Question

Quizplus · Accepted Answer

Two sigma implies that 95.46% fall within standards, or less than 45,400 defects per million.
For the basis of comparison:
1 sigma is 68.26%. This would be 317,400 defects per million.
2 sigma is 95.46%. This would be 45,400 defects per million.
3 sigma is 99.73%. This would be 2,700 defects per million.
6 sigma is 99.99985%, or less than 2 defects per million.
Key takeaway: Two sigma is towards the low range of acceptable quality in most manufacturing organizations.

Another Company Makes 1,000,000 Parts