High School

Based on the Stanford-Binet Intelligence Scales, ten-year-old Marjorie has a mental age of fifteen. What is her IQ?

A. 10
B. 150
C. 100
D. 15

Answer :

Final answer:

Marjorie's IQ would be calculated using the formula 'IQ = mental age ÷ chronological age × 100'. With a mental age of 15 and chronological age of 10, her IQ is B) 150.

Explanation:

Based on the Stanford-Binet Intelligence Scales, to calculate ten-year-old Marjorie's IQ, we would use the formula:

IQ = mental age ÷ chronological age × 100.

Marjorie's mental age is 15, and her chronological age is 10. Substituting these values into the formula gives us:

IQ = 15 ÷ 10 × 100 = 150.

Therefore, the correct answer is B. 150.

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