Python program to find variance; Through this tutorial, i am going to show you how to find or compute variance in python.

In this tutorial, i will write a programs to compute variance in python.

## Python Program to Find the Variance

See the following python programs to find variance; as shown below:

- Write a program to calculate variance in python.
- Python calculate variance without numpy

### Write a program to calculate variance in python

import numpy as np dataset= [21, 11, 19, 18, 29, 46, 20] variance= np.var(dataset) print(variance)

**Output**

108.81632653061224

Note:- Python variance() is an inbuilt function that is used to calculate the variance from the sample of data (sample is a subset of populated data). **Python statistics** module provides potent tools, which can be used to compute anything related to Statistics.

### Python calculate variance without numpy

#define a function, to calculate variance def variance(X): mean = sum(X)/len(X) tot = 0.0 for x in X: tot = tot + (x - mean)**2 return tot/len(X) # call the function with data set x = [1, 2, 3, 4, 5, 6, 7, 8, 9] print("variance is: ", variance(x)) y = [1, 2, 3, -4, -5, -6, -7, -8] print("variance is: ", variance(y)) z = [10, -20, 30, -40, 50, -60, 70, -80] print("variance is: ", variance(z))

**Output**

variance is: 6.666666666666667 variance is: 16.5 variance is: 2525.0

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