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William Stern describes the concept of Intelligence Quotient (IQ). It was __________.

  • A.\(\text{IQ} = \frac{\text{C.A.}}{\text{M.A.}} \times 100\)
  • B.\(\text{IQ} = \frac{\text{M.A.} \times \text{C.A.}}{100}\)
  • C.\(\text{IQ} = \frac{\text{M.A.}}{\text{C.A.}} \times 100\)
  • D.\(\text{IQ} = \frac{\text{C.A.}}{\text{M.A.}} \times 1000\)

Answer: C

The formula is IQ = M.A. / C.A. × 100.

William Stern proposed the intelligence quotient as the ratio of mental age (M.A.) to chronological age (C.A.); Lewis Terman later multiplied it by 100 to remove decimals:

\[ \text{IQ} = \frac{\text{M.A.}}{\text{C.A.}} \times 100 \]

A child of 10 with a mental age of 12 thus has an IQ of 120. The other options invert the ratio, multiply the two ages, or use 1000, none of which gives an average child an IQ of 100.

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