The Stanford-Binet Intelligence Scale original concept of Intelligence Quotient (IQ) was formulated as:

Topic: Psychological Testing
Subtopic: Intelligence

A(Chronological Age / Mental Age) × 100

B(Mental Age / Chronological Age) × 100

C(Mental Age + Chronological Age) / 2

D(Mental Age × Chronological Age) / 100

Explanation

William Stern proposed the ratio IQ formula: $IQ = frac{Mental Age}{Chronological Age} times 100$, popularized by Lewis Terman.

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