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What is an outlier in math?

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Quick Answer

An outlier in math is a value in a collection of data points that lies outside of the range of the other data points. The name is derived from the data point "lying outside" of the other given values.

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An example of an outlier can be seen in a group of data points taken from some athletes' performances: if there was one athlete that performed much more poorly than the other athletes, his performance is the outlier of the group.

Outliers of a data set most seriously affect the mean. The mean is reached by adding the data points together, then dividing the sum by the number of data points.

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