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For jobs that require a college degree, race differences in cognitive ability in the workplace should be minimized by the process of obtaining that college degree. But it hasn’t worked that way since at least the 1970s. Colleges have been complicit in transmitting the mean IQ differences by race in the general population not only through the college pipeline but through the graduate-education pipeline as well.”

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The mean IQs of Africans and Latins increase with each higher category, just as the European means do, but the size of the difference generally keeps pace. In the case of the European–African difference, the size of the difference tends to increase along with IQ, from 1.01 SDs for occupations with European mean IQs under 100 to 1.20 SDs for European mean IQs of 110 or higher. "

― Charles Murray , Facing Reality: Two Truths about Race in America