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I read that according to the Diagnostic and Statistical Manual of Mental Disorders, the IQ threshold for "intellectual disability" (retardation) is generally below 70, with deficits in adaptive functioning. 
The average IQ for Somalis is estimated at 68 according "The Intelligence of Nations" (by Richard Lynn and David Becker).

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This is inaccurate because the tests are not adjusted for foreign countries. For the same reason Bulgarians show lower IQs than Americans and we all know Bulgarians are a lot smarter.