On the original Stanford-Binet test, an 8-year-old who responds with the proficiency of an average 10-year-old would have an intelligence quotient (IQ) of .

125

Explanation: The stanford-binet test is the wide adopted American standard for measuring intelligence Quotient which is a revision of the original Binet-Simon scale.

Intelligence Quotient is calculated as the ratio of mental to chronological age multiplied by 100.

Written mathematically as;

IQ = (mental age ÷ chronological age) × 100

Mental age = 10

Chronological age = 8

Intelligence Quotient (IQ) =

IQ = (mental age ÷ chronological age) × 100

IQ = (10 ÷ 8) × 100

IQ = 1.25 × 100

IQ = 125

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