import numpy as np
import matplotlib.pyplot as plt

p, N = 0.3, 10
n = [np.sum(np.random.rand(N)<p) for i in range(10000)]

fig = plt.figure(figsize=(6,6), dpi=80)
plt.hist(n, bins=10, range=(-0.5,9.5), rwidth=0.8)
plt.show()