import numpy

import matplotlib.pyplot as plt

​

x = [1,2,3,5,6,7,8,9,10,12,13,14,15,16,18,19,21,22]

y = [100,90,80,60,60,55,60,65,70,70,75,76,78,79,90,99,99,100]

​

mymodel = numpy.poly1d(numpy.polyfit(x, y, 3))

​

myline = numpy.linspace(1, 22, 100)

​

plt.scatter(x, y)

plt.plot(myline, mymodel(myline))

plt.show()

​