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This rule is related to the standard deviation of a sampled population.

In research, data is collected to find out something about the subjects being studied or examined. In most cases, we expect the collected statistics (data) to fit the normal distribution, which is also called the "bell curve" distribution. If the data fits this curve, there will be three distinct points along the bell curve that are statistically important.

These three points are the first, second, and third standard deviations from the sample mean. The numbers 68, 95, and 99 correspond to the percentage of all samples that will fall within the three regions defined by the 1st, 2nd, and 3rd standard deviations.

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