title: How to normally distribute the data using Statistics
body: <p>I have a data sample 
  (say 1.9
  4.8
  3.9
  4.7
  2.3
  4.6
  3.9)</p>
  
  <p>I want to distribute the data on Bell Curve and give ratings between 1 to 5. How to do so using statistics.? </p>
  
  <p>(The top 20% will be rated 5, then 4 and so on)</p>