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Answer :
Twelve-year-old Arnold received an IQ test score of 75. What is his mental age?
9
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Final answer:
An IQ test score is calculated by comparing the test taker's mental age to their actual age. In Arnold's case, with an IQ of 75, his mental age is 9.
Explanation:
The IQ score is determined by comparing a person's mental age with their chronological age. If a twelve-year-old Arnold has an IQ of 75, this means that his mental age is 75% of his chronological age. Mental age is a concept used to describe the level of mental performance or intellect an individual has, correlating it to the age at which that level is average. In this case, we will calculate it by multiplying his chronological age by his IQ score divided by 100. So, Arnold's mental age would be 12 * 75 / 100 = 9. Therefore, the answer is d. 9.
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