title: Scripts for computing the average of a list of numbers in a data file
body: <p>The file <code>data.txt</code> contains the following:</p>
  
  <pre><code>1.00 1.23 54.4 213.2 3.4
  </code></pre>
  
  <p>The output of the scripts are supposed to be:</p>
  
  <pre><code>ave: 54.646
  </code></pre>
  
  <p>Some simple scripts are preferred.</p>