INTELLIGENCE QUOTIENT
Less than 69: intellectual disability (2.5% of the population)
70 to 79: borderline
80 to 89: low average
90 to 109: average (50 % of the population)
110 to 119: high average
120 to 129: superior
Over 130: very superior  (2.5% of the population)
Mental age is median test score for given age
Chronological age is actual age of the person taking the test
Intelligence quotient = (  Mental age / chronological age ) 100

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