sqrt(8) = 2.828427
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If there are only k numbers x(1),x(2)....,x(k), the geometric mean is the kth root of the product of these k numbers. Example: find the geometric mean of 4,3,7,8 We want the fourth root of 4 x 3 x 7 x 8 = 672 =(672)^(1/4) = 5.09146 is the geometric mean. The geometric mean is normally defined only for a set of positive numbers.
Geometric mean of 36 and 2 is 8.48528137423857 Look at link: "Calculation of the geometric mean of two numbers".
The geometric mean of 4 and 5 is 4.472135955
Geometric Mean (2, 40) = sqrt(2*40) = sqrt(80) = sqrt(16*5) = 4*sqrt(5) = 8.944 (approx).
Calculating Geometric Means with Negative Values: http://www.buzzardsbay.org/geomean.htm#negative_values