I know. It was a typo while speed typing on one of these stupid phones with an overly sensitive keyboard. I'm not bad at English really. Its complicated maths I struggle with. Anything beyond working out how many 10 bags in an ounce I struggle with. My maths would have improved if I dealt in larger amounts most likely.
To be uncharacteristically generous to you I think you do write well and are obviously quite intelligent really (though often your strident contrarianism leads you to illogical conclusions). Now use your intelligence to explain this:
In the United States, the IQ gap between black and white people was gradually closing over the last decades of the 20th century, as black test-takers increased their average scores relative to white test-takers. For instance, Vincent reported in 1991 that the black?white IQ gap was decreasing among children, but that it was remaining constant among adults.[68] Similarly, a 2006 study by Dickens and Flynn estimated that the difference between mean scores of black people and white people closed by about 5 or 6 IQ points between 1972 and 2002,[69] a reduction of about one-third. In the same period, the educational achievement disparity also diminished.[70] Reviews by Flynn and Dickens,[71] Nicholas Mackintosh,[72][page needed] and Nisbett et al.[73][74] all concluded that the gradual closing of the gap was a real phenomenon.