title: Historgram function for matplotlib returning weird y-axis values
body: <p>I am trying to understand the <code>matplotlib.hist</code> function. I have the following data:</p>
  <pre><code>cs137_count = np.array([this has a size of 750 and integers in the range from 1820 to 1980])
  plt.figure()
  plt.hist(cs137_count, density=True, bin = 50)  
  plt.ylabel('Distribution')
  plt.xlabel('Counts');
  </code></pre>
  <p>but the plot it provides has weird values for the <code>y-axis</code> in the range from <code>0 - 0.016</code> which makes no sense and I am not sure why it returns those values? I have attached an image of the plot below.</p>
  <p><img src="https://i.stack.imgur.com/1oplI.png" alt="Image of plot" /></p>