title: Whether is it possible to plot normal probability distribution in gnuplot
body: <p>My data file is as-</p>
  
  <pre><code> 2 3 4 1 5 2 0 3 4 5 3 2 0 3 4 0 5 4 3 2 3 4 4 0 5 3 2 3 4 5 1 3 4
  </code></pre>
  
  <p>My requirement is to plot normal PDF in gnuplot.
  I could do it by calculating f(x) </p>
  
  <pre><code>f(x) = \frac{1}{\sqrt{2\pi\sigma^2} } e^{ -\frac{(x-\mu)^2}{2\sigma^2} } 
  for each x using shell script. 
  </code></pre>
  
  <p>Then I plot it in gnuplot using the command-</p>
  
  <pre><code>plot 'ifile.txt' using 1:2 with lines
  </code></pre>
  
  <p>But whether is it possible to plot directly in gnuplot?</p>