如何在 Python 中使用 Matplotlib 绘制直方图以获取概率？

Question

I have taking probability using randint function. but i am facing issue in histogram to show my probability. my Probability output like this.

{60: 0.013, 6: 0.016, 99: 0.01, 25: 0.006, 45: 0.017, 51: 0.009, 72: 0.011, 8: 0.015, 10: 0.015, 82: 0.011, 50: 0.014, 43: 0.012, 52: 0.011, 74: 0.015, 12: 0.015, 39: 0.01, 89: 0.014, 7: 0.009}

My python code.

from collections import Counter
import numpy as np
import matplotlib.pyplot as plt

hist = np.random.randint(low=1, high=100, size=1000)
counts = Counter(hist)
total = sum(counts.values())
hist = {k:v/total for k,v in counts.items()}


num_bins = 10
n, bins, patches = plt.hist(hist, num_bins, normed=1, facecolor='blue', alpha=0.5)
#plt.plot(bins, hist, 'r--')
plt.xlabel('Grades')
plt.ylabel('Probability')
plt.title('Histogram of Students Grade')
plt.subplots_adjust(left=0.15)
plt.show()

Answer 1

If you just comment out plt.plot(bins, hist, 'r--') you get this plot:

Is this what you are looking for?

If you want to make use of n , bins and patches you can refer to this example in the Matplotlib documentation.