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Bell Curve
A graphical depiction of a normal distribution, showing how the frequency of an event's occurrence varies in relation to its deviation from the mean.
Population
The total number of individuals or organisms residing within a particular geographical area or belonging to a specific category.
Mental Age
An assessment measure that reflects the mental ability of an individual expressed in the age at which normal individuals reach an equivalent level of performance.
Chronological Age
The actual age of an individual measured in years from the date of birth.
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