Question

R2.72: When is the estimated percent defective for the upper specification area of a normal distribution that has two-sided limits and a Cp=1 and Cpk=1?

A. 35ppm

B. 2650ppm

C. 135ppm

D. 1350ppm

Answer 1

99.73 percent of the area is under the normal distribution which has two sided limits with a Cp=1 and Cpk=1. Thus, .27% is the percent defective for the entire curve, thus for the upper tail it would be .135% or 1350 ppm.

So your answer for this question is D. 1350 ppm