Python Program Calculate the standard deviation

Python program find standard deviation; In this tutorial, you will learn how to find standard deviation in python with and without inbuilt function.

Python Program Calculate the standard deviation

• Python program to calculate standard deviation
• How to find standard deviation in python without inbuilt function

Python program to calculate standard deviation

# import statistics library
import statistics
 
print(statistics.stdev([1,2,3,4,5,5,5,6,7,8]))
 
print(statistics.stdev([40,45,35,10,15,18,12,16], 45))

Output

2.1705094128132942
13.829962297231946

Note:- stdev() function in python is the Standard statistics Library of Python Programming Language. The use of this function is to calculate the standard deviation of given continuous numeric data.

How to find standard deviation in python without inbuilt function

#define a function, to calculate standard deviation
def stdv(X):
    mean = sum(X)/len(X)
    tot = 0.0
    for x in X:
        tot = tot + (x - mean)**2
    return (tot/len(X))**0.5

# call function with following data set
x = [1, 2, 3, 4, 5, 6, 7, 8] 
print("Standard Deviation is: ", stdv(x))

y = [1, 2, 3, -4, -5, -6, -7, -8] 
print("Standard Deviation is: ", stdv(y))

z = [10, -20, 30, -40, 50, 60, -70, 80] 
print("Standard Deviation is: ", stdv(z))

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Output

Standard Deviation is:  2.29128784747792
Standard Deviation is:  4.06201920231798
Standard Deviation is:  48.925964476952316

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