That's just the arithmetic mean, which is what is wanted in most cases, sure. But when you are computing, say, average annual returns on investments, you need the geometric mean. If you know how fast you went on each (equidistant) leg of a journey, your average speed is computed using the harmonic mean.
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ninetydegrees
Re: for the record...
on 2011-01-27 02:58 pm (UTC)