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# contraharmonic mean

Most people ask for happiness on condition. Happiness can only be felt if you don't set any condition.
Arthur Rubinstein

## English

### Noun

 Singular contraharmonic mean Plural {{{1}}}
contraharmonic mean ({{{1}}})
1. (mathematics) A type of average calculated as the arithmetic mean of the squares of the values divided by the arithmetic mean of the values, ie. $C = { {( x_1^2 + x_2^2 + ... + x_n^2) \over n } \over { ( x_1 + x_2 + ... + x_n ) \over n } }\ or \ C(x_1, x_2, ..., x_n) ={ { x_1^2+x_2^2+...+x_n^2} \over {x_1+x_2+...+x_n }}$

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