An Example of Python in Calculating Mean Variance and Standard Deviation

As shown below:

import numpy as np 
arr = [1,2,3,4,5,6]
# Average value 
arr_mean = np.mean(arr)
# Calculate variance 
arr_var = np.var(arr)
# Find standard deviation 
arr_std = np.std(arr,ddof=1)
print(" The average value is: %f" % arr_mean)
print(" The variance is: %f" % arr_var)
print(" The standard deviation is :%f" % arr_std)