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That is an upper or lower control limit 3 standard deviations from the mean. It also means you will have 66807 defects per million opportunities.

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Three sigma limits refer to a statistical concept where data points outside three standard deviations from the mean are considered unusual or significant. This range covers about 99.7% of the data in a normal distribution, making it a common measure of variability in quality control and process improvement. Identifying points beyond three sigma limits can indicate potential issues or anomalies that may require further investigation or corrective action.

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10mo ago
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Q: What is meant by three sigma limits?
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