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Calculating Geometric Mean Using Logarithms (Logs)
There are two widely recognized methods for
calculating geometric mean: the Square Root Method and the Log Method.
Class II wastewater operators learn the simpler square root (√) method,
but it only works if you are averaging 2 samples, 4 samples, 8 samples,
16 samples, 32 samples, 64 samples, etc. Otherwise, the log method must
be used. So if you sample fecal coliform 3 or 5 or 6, 7, 9, 10, etc.
times per month, use the log method described below.
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Calculating Geometric Mean Using The Square Root Method
Using the
square root (√) method to calculate geometric mean is the easiest way
and only requires a basic function calculator with a √ key. Remember,
this method can only be used when calculating results from 2 samples, 4
samples, 8 samples, 16 samples, etc.
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