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How does the IQ rating scale work?

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Quick Answer

The most commonly used IQ rating scale as of 2014, the Stanford-Binet scale, classifies intelligence as ranging from feeble-mindedness to genius. The Wechsler scale and Cattell's scale are two other scales that are useful for quantifying intelligence, although there is some disparity among these scales.

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How does the IQ rating scale work?
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Full Answer

According to the Stanford-Binet scale, a score of less than 70 indicates feeble-mindedness, a score of 70 to 79 indicates a borderline deficiency in intelligence, a score of 80 to 89 indicates dullness and a score of 90 to 109 indicates average or normal intelligence. A score of 100 is the average score. A score of 110 to 119 signifies superior intelligence, a score of 120 to 140 indicates very superior intelligence, and a score greater than 140 indicates genius or almost genius intelligence.

The Wechsler scale classifies a score of under 70 as extremely low, a score of 70 to 79 as borderline, a score of 80 to 89 as low average, a score of 90 to 109 as average, a score of 110 to 119 as high average, a score of 120 to 129 as superior and a score greater than 130 as very superior. Cattell's scale classifies a score of 90 to 99 as below average, a score of 100 to 119 as average, a score of 120 to 139 as above average, a score of 140 to 159 as highly intelligent and a score greater than 160 as genius level.

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