Z-Score

Problem

Return the z-score (x - mean) / std where std is the population standard deviation. Return 0.0 if data is empty or the standard deviation is zero.

Hint

Population variance divides by n.

case 1

in: [[1,2,3,4,5],5]

expected: 1.414213562373095

case 2

in: [[1,2,3],2]

expected: 0

case 3

in: [[10],10]

expected: 0

case 4

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

expected: 1

case 5

in: [[],1]

expected: 0

Starter codePython

def zscore(data, x):
    # Your code here
    pass

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