The geometric mean of two numbers is the square root of their product. 18 x 8 = 144. The square root of 144 is 12. The geometric mean of 18 and 8 is 12.
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MEAN = ( 8+10 )/2 = 18/2 =9
The geometric mean of 18 and 54 is 31.176914
The geometric mean of 18 and 27 is 22.045407685
The geometric mean of 18 and 30 is approximately 23. 2379 (√(18 x 30) = √540).
The Geometric Mean of 12 and 27 is 18.0