title: remove data greater than 95th percentile in data frame
body: <p>I have a data like this:</p>
  
  <p>df:</p>
  
  <pre><code>Group   Point
  A       6000
  B       5000
  C       1000
  D        100
  F        70
  </code></pre>
  
  <p>Before I graph this df, I only like to remove values over than 95th percentile in my data frame. Any body tell me how to do that?</p>