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Represents the characteristics that are typical for— that is, exhibited by—most members of a particular group.

For statistical purposes, normal means whatever is average for a given group of people ("the norm"). Therefore, the term normal does include those group members who deviate significantly from the measures of central tendency (the mean, the median, or the mode) of a given distribution.

The term normal is fundamentally statistical and quantitative. In testing and measuring, for example, normal can be defined as a central cluster of scores in relation to a larger grouping. In intelligence testing normal...