Harmonic mean

The harmonic mean gives us a way to find the average of a set of values that emphasizes the smaller numbers in the set, making it particularly useful when averaging rates or ratios, like speeds or densities.

$$\text{Harmonic Mean}=\frac{n}{\frac{1}{x_1}+\frac{1}{x_2}+\cdots +\frac{1}{x_n}}$$