Coefficient of Variation

Problem

Return the coefficient of variation: the sample standard deviation divided by the absolute value of the mean. Return 0.0 when n < 2 or the mean is zero.

Hint

Compute the sample standard deviation, then divide by abs(mean).

Test cases

case 1

in: [[2,4,4,4,5,5,7,9]]

expected: 0.427617987059879

case 2

in: [[10,20,30]]

expected: 0.5

case 3

in: [[5,5,5]]

expected: 0

case 4

in: [[-2,-4]]

expected: 0.47140452079103173

case 5

in: [[0,0]]

expected: 0

Starter codePython

def coefficient_of_variation(data):
    # Your code here
    pass

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