Even if there was a proven connection between race and intelligence, it would be information that you could not actually use. We have (good) laws that prevent discrimination based on a variety of factors. One thing I learned when I was a saleman was "Never pre-judge a sale". Same thing applies to employees, possible friends, etc.
Or, as the Sargent in "Gettyburg" says, " Anyone who judges by the group is a fool".

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags