Standard Deviation Calculator Python

The Standard Deviation is a measure of how spread out numbers are.

Standard Deviation is a quantity expressing by how much the members of a group differ from the mean value for the group.

Its symbol is σ (the greek letter sigma)

Following Code will calculate the Standard Deviation:

Code::

import math
def average(l):             #function to calculate average(mean)
    total=0.0
    for i in l:
        total=total+int(i)
    if(len(l)==0): return 0
    else: return(total/len(l))
    
def standardeviation(l,ave):       #function to calculate standard deviation
    diff=0.0
    for i in l:
        x=int(i)-ave
        diff=diff+x*x
    if(len(l)==0): return 0
    else :return(math.sqrt(diff/len(l)))    


lst=[]
num=input("Enter Values ,enter -1 to end:")
while num!='-1':
    lst.append(num)
    num=input()
ave=average(lst)
print("Average is:",ave)
sd=standardeviation(lst, ave)
print("Standard Deviation :",sd)
        
Output::