Troubleshooting Bacteria Levels at Wastewater ... .gov

The daily average for bacteria concentration is a geometric mean. Calculating the geometric mean requires that you multiply the numbers for the month and take the nth root of the result. What does that mean? If you have 4 bacteria results, multiply the results and take the fourth root. Where your results a re 20, 35, 40, 60, the geometric mean is ................
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