MediumProbabilitypr-367

Lognormal Variance Value

Problem

The lognormal variance is (exp(sigma^2) - 1) * exp(2 mu + sigma^2).

Given mu and sigma, return the variance.

Hint

It factors through the second moment minus the squared mean.

case 1

in: [0,1]

expected: 4.670774270471604

case 2

in: [1,0.5]

expected: 2.694758124344947

case 3

in: [0,0]

expected: 0

Starter codePython

def lognormal_variance_value(mu, sigma):
    # Your code here
    pass

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