title: How to add a standard normal pdf over a seaborn histogram
body: <p>I would like to add a standard normal pdf curve over a histogram built with <code>seaborn</code>. </p>
  
  <pre><code>import numpy as np
  import seaborn as sns 
  x = np.random.standard_normal(1000)
  sns.distplot(x, kde = False)
  </code></pre>
  
  <p>Any help would be appreciated!</p>