Studies going back over 50 years have repeatedly arrived at the same conclusion -- racists have lower IQs than non-racists. The average intelligence quotient (IQ) of all members of the human race is 100 on the Stanford-Binet scale, as illustrated in the bell curves in the figure below.


The average IQ of racists is up to 4 IQ points less than this (Montagu 1952 & 1988, Allport 1946, Frenkel-Brunswick and Sanford 1945). The reasons this is true are not entirely clear. Does racism attract the unintelligent or do the unintelligent default into racist mentalities?