A number expressing the central or typical value in a set of data, in particular the mode, median, or (most commonly) the mean, which is calculated by dividing the sum of the values in the set by their number.
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It is called a definition.
average
By definition, an IQ of 100 is average.
The average IQ is, by definition, 100.
100 is the average 130 and more = gifted people