Harmonic Mean is the reciprocal of the arithmetic mean of
the reciprocals. In other words, it is the number of observations, divided by
the sum of reciprocals of the observations. This is also one of several kinds
of average and it is appropriate for situations when the average of rates is
desired. The harmonic mean of 2 is 2 because there are other numbers to be observed.
Feb 23rd, 2015
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