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By definition, the mean result of many IQ tests must be 100. If the mean result

of tests applied to a large, statistically significant population varies from 100, the

implication is that the test is skewed, and the test is modified. The composition

and procedure for IQ testing is highly controversial.

But since you asking directly about American IQ it is generaly lower than for the rest of the world so it is about 78.

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12y ago

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