Answer :
Final answer:
Option B. 9
The term 'mental age' is a measure of a child's mental development relative to others. For twelve-year-old Benjy, who has an IQ of 75, his mental age would be calculated using a standard formula. Thus his mental age would be 9 years old.
Explanation:
Twelve-year-old Benjy's mental age is determined by the score he received on the Stanford-Binet Intelligence test. The Stanford-Binet Intelligence test is a cognitive ability and intelligence test that measures a person's intellectual quotient (IQ). The term "mental age" in psychology refers to an indicator of a child's intellectual development that is based on the age in which an average child would achieve a particular score on an IQ test. A child's mental age is calculated with the formula: (IQ score x chronological age)/100. Given Benjy's IQ score of 75, his mental age is calculated as follows: (75 x 12)/100 = 9. Therefore, the correct answer for Benjy's mental age is B) 9 years old.
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