That is, the sum of squares of some numbers divided by the sum of the numbers. The term "antiharmonic mean" has been coined for this quantity. I'm hoping there is a better name.
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closed as too localized by Simon Thomas, Daniel Moskovich, Mark Sapir, Chandan Singh Dalawat, José FigueroaO'Farrill Nov 30 '10 at 3:40This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. If this question can be reworded to fit the rules in the help center, please edit the question. 

