Variance of Sample Mean

Problem

For n independent observations with variance sigma^2, the sample mean has variance sigma^2 / n.

Given sigma and n, return the variance of the sample mean.

Hint

Averaging shrinks variance by the sample size.

case 1

in: [2,4]

expected: 1

case 2

in: [1,100]

expected: 0.01

case 3

in: [10,25]

expected: 4

Starter codePython

def variance_of_sample_mean(sigma, n):
    # Your code here
    pass

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