According to the original IQ formula, a 40-yr-old with the same IQ score as the average 20-year-old would be considered mentally retarded.

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Quizplus · Accepted Answer

The original IQ formula used mental age and chronological age to calculate IQ, which meant that a 40-year-old with the same mental age as the average 20-year-old would have an IQ of 50, which is considered mentally retarded. However, this formula is outdated and no longer commonly used. Modern IQ tests use standard deviation to calculate scores and do not have a fixed threshold for mental retardation.

According to the Original IQ Formula, a 40-Yr-Old with the Same