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The

**Empirical Rule**, sometimes called the 68-95-99.7 rule, states that for a given dataset with a normal distribution:**68%**of data values fall within one standard deviation of the mean.

**95%**of data values fall within two standard deviations of the mean.

**99.7%**of data values fall within three standard deviations of the mean.

Test your knowledge of the Empirical Rule using the practice problems below.

The height of plants in a certain garden are normally distributed with a mean of 12.3 inches and a standard deviation of 4.1 inches.

**Use the Empirical Rule to estimate what percentage of plants are between 8.2 and 16.4 inches tall.**