a/x = x/b
Solve that proportion where x is the mean and a and b are the other 2 numbers.
Your answer ends up being 3.6
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It is 6*sqrt(2)
Geometric mean of 12 and 15 is 13.416407864998738 Look at link: "Calculation of the geometric mean of two numbers".
To calculate this, you multiply 5 x 6, then take the square root of the result. To calculate the geometric mean of three numbers, multiply them and take the cubic root. Etc.
square root of (6 x 20) = square root of (120) = 10.95
The mean, median, and mode are not always equal. For example, consider the set of 5 values {2, 3, 5, 10, 10}. The arithmetic mean is 6. (The values sum to 30, and 30 divided by 5 is 6.) The median is 5. (The middle number of the 5 values, when sorted, is 5.) The mode is 10. (The value 10 appears most often in the set.) And, you probably didn't ask, but: The geometric mean is the fifth root of 3000, or about 4.96. The harmonic mean is 150 divided by 37, or about 4.05. The quadratic mean is the square root of 47.6, or about 6.9. Although the word "average" can technically be used to describe all of these values, in common parlance the word "average" refers to just the arithmetic mean.