https://en.wikipedia.org/wiki/IQ_classification#Historical_IQ_classification_tables https://en.wikipedia.org/wiki/IQ_classification#Historical_I... I can't fin

https://en.wikipedia.org/wiki/IQ_classification#Historical_IQ_classification_tables https://en.wikipedia.org/wiki/IQ_classification#Historical_I... I can't find a particularly ironclad source, but I read recently that the test structure is such that scores over, for example, 175, are not meaningfully variable. At that point, the test isn't capable of or effective measuring further differences.