Calling all chess mathematicians and statisticiansneed formula

I want to figure out a formula that reveals to what percentage chess belong based on their ratings. For example, if a player is 2000 then that’s an indication of belonging to the top 10% of the chess players of the world or 1500 indicates top 50% of chess players in the world, for arguments sake. Maybe

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I'm just trying to understand the first two questions. I don't know if I have to use a formula or I just say the percentage straight from the article. (Subject:Quantitive Reasoning)

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