How to Calculate a Geometric Mean . By Dave Feldman, DEQ . M. ost MPDES permits in Montana require permitees to calculate a geometric mean when more than one bacterial (fecal coliform or E. coli) sample is collected during a reporting period (7-day or 30-day). I wrote this article to help people understand the geometric mean. Learn and know one of the important formulas in geometric progression i.e. geometric mean formula. Like A.M. in A.P, we have So directly we will learn what is geometric mean and formula for finding geometric mean. First, we will understand geometric...The Arithmetic Mean-Geometric Mean Inequality (AM-GM or AMGM) is an elementary inequality, and is generally one of the first ones taught in inequality courses. AM-GM states that for any set of nonnegative real numbers...GEOMETRIC MEAN FORMULA The geometric mean is a type of mean that indicates the central tendency or typical value of a set of numbers. It is defined as the nthnth root of the product of nn numbers. Formula for evaluating geometric mean is as follows, if we...Geometric mean definition and formula. Geometric mean vs arithmetic mean. With this geometric mean calculator, all calculations will be a pleasure! Just type the numbers of which you want to calculate the geometric mean and the result will appear in no time.