harmonic mean

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Noun

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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