If you consider surveys of lawyers, accountants or engineers, for instance, the average IQ may lie around 125 – showing that intelligence does give you an advantage. But the scores cover a considerable range, between around 95 (below average) and 157 (Termite territory).33 And when you compare the individuals’ success in those professions, those different scores can, at the very most, account for around 29 per cent of the variance in performance, as measured by managers’ ratings.34 That is certainly a very significant chunk, but even if you take into account factors such as motivation, it
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