2.1%, but yeah just around it
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Maybe the Venn diagrams don't necessarily overlap exactly, though, if you can visualize what I mean. For example, there may be highly proficient readers who are highly motivated and hard workers, but not top quintile of IQ; overachievers, if you will.
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And I could imagine a few poor souls of normal intelligence who through horrid personal circumstances were never really taught.
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There's more -2 than there are +4
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The entirety of the bell curve can be shifted to the right with good policies and investment.
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That's a hypothesis. But if you were to compare the 96% literacy rate in the USA with UNESCO literacy rates (quite possibly to a different standard), there's quite a few places that do better.
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Back in the 1980s and 1990s, my mum used to volunteer for Adult Basic Education; quite a few functionally illiterate adults were teachable. 4% also seems to be too high to be explained by Intellectual Disability - the rate (from quite old figues) seems to be about 0.7%.
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I had an acquaintance who was illiterate but super Smart she was most of the way through high school when I met her, plans to go to college. She took all her tests orally. A real talker too!
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