Define the harmonic mean (HM) of positive numbers x1, …, xn.

Define the harmonic mean (HM) of positive numbers x1, …, xn.

A HM = n/(Σ 1/xi)

B HM = (x1 x2 … xn)^(1/n)

C HM = (x1 + … + xn)/n

D HM = sqrt((x1^2 + … + xn^2)/n)

Solution

Correct Answer: Option A