Generally, the IQ gap sizes found by Lynn are replicated by others, and by under tests such as PISA, TIMSS.
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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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 …
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