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Approximate cumulative IQ distributions in the U.S. based on Wechsler Adult Intelligence Scale IQs for Whites (mean = 101.4, SD = 14.7) and Blacks (mean = 86.9, SD = 13.0) from (Reynolds, Chastain, Kaufman, & McLean, 1987, p. 330); distributions for Hispanics (mean = 91) and Asians (mean = 106) are less precise.