1.05a_cumplot.py

import numpy as np
import matplotlib.pyplot as plt

xax = np.array([1.7,7.7,18.8,27.2,34.5,37.5,37.8,38.1,36.8,35.7,34.9])
yax = np.array(["0-9","10-19","20-29","30-39","40-49","50-59","60-69","70-79","80-89","90-99","100-109"])

values, base = np.histogram(xax, bins=10)

cum = np.cumsum(values)
yax_arrange = y_axis = np.arange(1, len(yax) + 1, 1)
xax_arrange = x_axis = np.arange(xax.min(), xax.max(), 3)

plt.yticks(yax_arrange, yax)
plt.xticks(xax_arrange, xax)
plt.plot(base[:-1], cum, c='blue')

plt.show()