Answer :
Matthew's IQ, calculated using the Stanford-Binet formula, is 120, as his mental age is 12 and his chronological age is 10. indicating above-average intelligence.Hence option D 120 is correct answer.
To calculate Matthew's IQ using the Stanford-Binet intelligence test formula, the ratio of mental age to chronological age must be determined and then multiplied by 100. Matthew's mental age is given as 12 years, and his chronological age is 10 years. By applying the formula, we find that Matthew's IQ is calculated as follows:
IQ = (mental age \/ chronological age) \\times 100 = (12 \/ 10) \\times 100 = 1.2 \\times 100 = 120.Thus, the correct option is D) 120. This score suggests that Matthew is performing intellectually at a level typical for a 12-year-old, which is higher than the average for his actual age of 10. This indicates he has a higher than average IQ for his age.Hence option D 120 is correct answer.
