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407,000 runners finished marathons in the USA in 2007. With the population at around 303,500,000 that calculates to about one-tenth of a percent, or 1 per every thousand. This answer above assumes every runner runs one marathon, only. If marathoners averaged 10 marathons each in 2007, that would be one-onehundredth of a percent who run marathons, by the above figures. Even that seems high to me.

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โˆ™ 2009-07-18 07:59:10
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Q: What percentage of the population run marathons?
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