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OK, yeah, that works. (I should have checked the original article instead of relying on reported hear-say.) I can well believe the median to be 4 books, and the median(? a bit unclear from the text, but the most likely interpretation) for those who read to be 7 books.
This would mean that 25% of the population don't read books, 25% read between 1 and 4 books per year, 13% read between 4 and 7 books per year, and 37% read 7 books per year or more. That's not so bad, all in all.
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