95% of data are within two standard deviations of the mean 99.7% of data are within three standard deviations of the mean, 68% of data are within one standard deviation of the mean.
What is empirical rule?
If your distribution follows a normal distribution, the standard deviation and mean can tell you where the majority of the data are.
The empirical rule, often known as the 68-95-99.7 rule, indicates where your values are located:
- 95% of data → within two standard deviations of the mean
- 99.7% of data → within three standard deviations of the mean
- 68% of data → within one standard deviation of the mean
Thus, 95% of data are within two standard deviations of the mean 99.7% of data are within three standard deviations of the mean 68% of data are within one standard deviation of the mean.
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