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He gives an IQ of 71, consistent with other sources. That means that approx 50% will be below the cutoff for mental retardation.
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Replying to @KirkegaardEmil @icefire99
Didn't Jensen say that due to the average IQ and that it is, say 1 SD from the black average that 70 iq blacks were normal while whites were
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"funny looking"?
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Yes. Most Jamaicans are of course not syndromic ID, merely the unlucky lower tail of norm dist. http://arthurjensen.net/wp-content/uploads/2014/06/1970-jensen.pdf …
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This distinction is made by many others, not really a Jensen-only thing. Wiki mentions it too. https://en.wikipedia.org/wiki/Intellectual_disability …
5:31 PM - 11 Oct 2017
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