Central tendency

In mathematics, an average, or central tendency of a data set refers to a measure of the "middle" or "expected" value of the data set. There are many different descriptive statistics that can be chosen as a measurement of the central tendency of the data items. The most common method is the arithmetic mean, but there are more than one type of average (median being another common example).
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The tendency of data gathered from a process to cluster toward a middle value somewhere between the high and low values of measurement.

Central tendency
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