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A 6-year-old able to do only what a 3-year-old can do has a Mental Quotient of .5 or ½ (3 divided by 6). Lewis Terman later multiplied the Mental Quotient by 100 to remove the fraction and the Intelligence Quotient (IQ) was born!

Mental Age/Chronological Age X 100 = Intelligence Quotient

The 6-year-old with the Mental Quotient of ½ has an IQ of 50.

The majority of people have an IQ between 85 and 115

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