How would I find the approximate percentage of values within a standard deviation of less than one on the normal model?
Chebyshev's rule is only used when the standard deviation is greater than or equal to 1.
2026-03-31 17:31:57.1774978317
Standard deviation of less than one
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A normal model has about 62.8% of its values within 1 standard deviation of the mean, regardless of the standard deviation. The wikipedia page for the first three standard deviations has a nice picture.