harmonic mean
Noun

The mean of n numbers expressed as the reciprocal of the arithmetic mean of the reciprocals of the numbers (synset 106033984)
domain category: statistics  a branch of applied mathematics concerned with the collection and interpretation of quantitative data and the use of probability theory to estimate population parametershypernym: mean, mean value  an average of n numbers computed by adding some function of the numbers and dividing by some function of n
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