Range Rule of Thumb Sigma

Problem

The range rule of thumb estimates the standard deviation as (max - min) / 4 for roughly bell-shaped data.

Given the sample values, return the estimate.

Hint

Divide the range by four.

case 1

in: [[10,20]]

expected: 2.5

case 2

in: [[-4,4]]

expected: 2

case 3

in: [[5,5,5]]

expected: 0

Starter codePython

def range_rule_of_thumb_sigma(values):
    # Your code here
    pass

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