Define the quadratic mean (QM or RMS) of positive numbers x1, …, xn.

Define the quadratic mean (QM or RMS) of positive numbers x1, …, xn.

A QM = (x1 + … + xn)/n

B QM = (x1 x2 … xn)^(1/n)

C QM = sqrt((x1^2 + … + xn^2)/n)

D QM = n/(Σ 1/xi)

Solution

Correct Answer: Option C