title: pylab.hist(data, normed=1). Normalization seems to work incorrect
body: <p>I'm trying to create a histogram with argument normed=1</p>
  
  <p>For instance:</p>
  
  <pre><code>import pylab
  
  data = ([1,1,2,3,3,3,3,3,4,5.1])    
  pylab.hist(data, normed=1)
  pylab.show()
  </code></pre>
  
  <p>I expected that the sum of the bins would be 1. But instead, one of the bin is bigger then 1. What this normalization did? And how to create a histogram with such normalization that the integral of the histogram would be equal 1?</p>
  
  <p><img src="https://i.stack.imgur.com/Mwj7z.png" alt="enter image description here"></p>