Nationalities associated with top ten IAAF-sanctioned human marathon performances as given on Wikipedia, conditional on this or similar being given, are all Kenya or Ethiopia

Created by KnaveOfAllTrades on 2015-03-05; known on 2015-03-05; judged right by KnaveOfAllTrades on 2015-03-05.

• KnaveOfAllTrades estimated 45% on 2015-03-05
• KnaveOfAllTrades   judged this prediction right on 2015-03-05.