Dallas is an 8-year-old boy who has a mental age of 11 years. His IQ would be about:
A) 100.
B) 130.
C) 115.
D) 85.

Question

Quizplus · Accepted Answer

IQ is calculated by dividing mental age by chronological age and multiplying by 100. In this case, Dallas has a mental age of 11 and a chronological age of 8, yielding an IQ of (11/8)x100 = 137.5. Since IQ scores are standardized with a mean of 100 and a standard deviation of 15, Dallas's IQ would be rounded to 130.

Dallas Is an 8-Year-Old Boy Who Has a Mental Age