What is the geometric mean of 3 and 15?

Answer 1

Just use the definition of geometric mean. Multiply all the numbers together, then take the square root. (In this case, it is the square, or second, root, because there are two numbers; for the geometric mean of three numbers, you take the cubic root, etc.)

Answer 2

geometric mean = √(3 × 15) = √45 = 3√5 ≈ 6.7082

Answer 3

The answer is 3*sqrt(5).