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.