is x Is Phenotype

22.10 The proportions of a normal distribution occupied by plus or minus one, two, and three standard deviations from the mean.

deviations (x ± 2s) includes approximately 95% of the measurements, and the mean plus or minus three standard deviations (x ± 3s) includes approximately 99% of the measurements (IFigure 22.10). Thus, only 1% of a normally distributed population lies outside the range of x ± 3s.

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