Twelve-year-old Arnold received an IQ test score of 75. Using the original definition for IQ, what is his mental age?
A) 9
B) 10
C) 5
D) 7
Answer: A
Rationale: The original formula for calculating the intelligence quotient (IQ) was mental age ? chronological age ? 100. Using this equation, a 12-year-old would have an IQ of 75 if his mental age was 9, (9 ? 12) = 0.75; 0.75 ? 100 = 75.
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