title: Excel: Average Difference in a single formula
body: <p>I have a dataset like this:</p>
  
  <pre><code>10, 23, 43, 45, 56;
  
  12, 25, 21, 23, 40;
  </code></pre>
  
  <p>I want to know the average of the difference between the two rows like</p>
  
  <blockquote>
    <p>mean (10 - 12, 23 - 25, 43 -21 ...)</p>
  </blockquote>
  
  <p>Of course, this is only an example and the actual rows are hundreds of element long. I would like to compute the average of the difference without having to compute somewhere the difference and then having the average. (The sheet is already pretty big)</p>
  
  <p>Thanks a lot</p>