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    Post Closed as "too localized" by Simon Thomas, Daniel Moskovich, Mark Sapir, Chandan Singh Dalawat, José Figueroa-O'Farrill

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What is the name for(a^2 + b^2 + c^2 +...)/(a + b + c +...)?

That is, the sum of squares of some numbers divided by the sum of the numbers. The term "anti-harmonic mean" has been coined for this quantity. I'm hoping there is a better name.