GEOMETRIC MEAN Take the log value of each sample (log button on the calculator) Add the log value of each sample together Divide by the number of samples.

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Presentation transcript:

GEOMETRIC MEAN Take the log value of each sample (log button on the calculator) Add the log value of each sample together Divide by the number of samples Take the antilog of the number for the geometric mean for the coliform result (the 10 x button on the calculator). 10 x LOG 10 x LOG 2nd

GEOMETRIC MEAN # of ColoniesLog 6 = = = = Total =

GEOMETRIC MEAN Divide by 4 (number of samples) = Take the Antilog (10 x )= Geometric Mean = 13 colonies/100 mL Report the Geometric Mean as 13 colonies/100 mL

GEOMETRIC MEAN Easiest way? Use Excel Enter numbers into a column At the next empty row type the command: =geomean select the cells with the numbers in parentheses: =geomean(A1:A5) Press enter!