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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.
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.
