Harmonic Mean of Rates

Problem

For rates that combine as reciprocals, such as speeds, the harmonic mean is n / sum_i (1 / x_i).

Given the rate list, return the harmonic mean.

Hint

Invert, average, and invert again.

case 1

in: [[1,2]]

expected: 1.3333333333333333

case 2

in: [[2,4,8]]

expected: 3.4285714285714284

case 3

in: [[10,10]]

expected: 10

Starter codePython

def harmonic_mean_of_rates(rates):
    # Your code here
    pass

3 test cases · run your code against them in the editor