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68-95-99 Rule Illustrated

The following image illustrates the 68-95-99 rule. 68% of the area of the normal curve lies in the region of m ± 1 s, meaning 68% of data points chosen from this distribution will have values of m ± 1 s. Similarly, 95% of the area is within m ± 2 s, and 99% of the area is within m ± 3 s.