Poisson Moments Mean Variance

Problem

The Poisson distribution has mean and variance both equal to lambda.

Given lambda, return [mean, variance].

Hint

Equidispersion is the defining property.

case 1

in: [2]

expected: [2,2]

case 2

in: [0.5]

expected: [0.5,0.5]

case 3

in: [10]

expected: [10,10]

Starter codePython

def poisson_mean_and_variance(lam):
    # Your code here
    pass

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