Day 1 Standard Deviation.py

#!/bin/python3

import math
import os
import random
import re
import sys

#
# Complete the 'stdDev' function below.
#
# The function accepts INTEGER_ARRAY arr as parameter.
#


def stdDev(arr):
    # Print your answers to 1 decimal place within this function
    n = len(arr)
    mean = sum(arr) / n
    variance = sum([((index - mean) ** 2) for index in arr]) / n
    std = math.sqrt(variance)

    print("{:.1f}".format(std))


if __name__ == '__main__':
    n = int(input().strip())

    vals = list(map(int, input().rstrip().split()))

    stdDev(vals)