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Noun

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harmonic mean (plural harmonic means)

  1. (mathematics) A type of measure of central tendency calculated as the reciprocal of the mean of the reciprocals, i.e.,  .
    The harmonic mean of two numbers   and   is the number   such that  . Combining the two ratios:  . Rotating the proportion 90° clockwise:  ; transposing twice to isolate the  :  . Likewise  ; these are both equivalent to the more typical, symmetrical equations:  .

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