The Normal Curve

 

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The Normal Curve

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The Normal Curve

The normal curve is one of the most common patterns of variation.

  • The normal curve is symmetrical around the mean value.

  • Most of the data points are close to the mean but the curve tails off in both directions getting closer and closer to zero.

  • Standard SPC techniques are based on the normal curve and its probabilities.

The “68-95-99.7 Rule” applies to all normal curves

  • 99.7% of process data fall within ±3 standard deviations of the mean.

  • 95% of process data fall within ±2 standard deviations of the mean.

  • 68% of process data fall within ±1 standard deviation of the mean.

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