Laplace Moments Mean Variance

Problem

The Laplace distribution with location mu and scale b has mean mu and variance 2 b^2.

Given mu and b, return [mean, variance].

Hint

The scale enters the variance quadratically.

case 1

in: [0,1]

expected: [0,2]

case 2

in: [2,0.5]

expected: [2,0.5]

case 3

in: [-1,3]

expected: [-1,18]

Starter codePython

def laplace_moments_mean_variance(mu, b):
    # Your code here
    pass

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