Question: A control chart was found to be stable and normally distributed with an average thickness of 0.2817 inches and a standard deviation of 0.013 inches,
A control chart was found to be stable and normally distributed with an average thickness of 0.2817 inches and a standard deviation of 0.013 inches, so you can now accurately calculate the baseline sigma level and parts per million (PPM) defective for this dimension. It has an upper specification limit of 0.3 inches and a lower specification limit of 0.25 inches. 1: What is the sigma level for this dimension? 2: What is this sigma level in parts per million (PPM) defective?
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