What is the IQ of a 10-year-old with a mental age of 8?
A) 125
B) 80
C) 1.25
D) 0.8
Answer: B
Rationale: The original formula for calculating the intelligence quotient (IQ) was mental age ? chronological age ? 100. Using this equation, a 10-year-old with a mental age of 8 would have an IQ of 80, (8 ? 10) = 0.8; 0.8 ? 100 = 80.
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