Gaussian distribution

#https://stackoverflow.com/questions/10138085/python-pylab-plot-normal-distribution
import numpy as np
import matplotlib.pyplot as plt

mean = 0; variance = 1
x = np.arange(-5,5,.01)
y = np.exp(-np.square(x-mean)/2*variance)/(np.sqrt(2*np.pi*variance))

plt.plot(x,y)
plt.ylabel('gaussian distribution')
plt.show()