Geometric mean of 10 and 30 is 17.320508075688774.
Look at link: "Calculation of the geometric mean of two numbers".
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What is the sum of the first 27 terms of the geometric sequence -3, 3, - 3, 3, . . . ?
To find the ARITHMETIC mean of 4 and 10, you add them up and then divide by n number of values: (4+10)/2 = 7 To find the GEOMETRIC mean, you multiply 4 and 10, and then find the nth root: the square root of 40 is 6.32 (to 3 significant figures).
The geometric mean of 8 is: 8.0
Used the GEOMEAN function on Excel and the answer it gave was 20.