import matplotlib.pyplot as plt
import numpy as np

gold,chihh=400,400
gold_height = 40 + 10 * np.random.randn(gold)
chihh_height = 25 + 6 * np.random.randn(chihh)

plt.hist([gold_height , chihh_height],stacked=True,color=['r','b'])
plt.show()
