title: Report Builder Total of Grouped Averages
body: <p>how can I summarize group average in a table I have earlier created. I don't want have the averages of the whole table.</p>
  
  <pre><code>1          A       10
  2          B       20 
  3          B       15
  4          A       20
  5          B       10
  By Group   A       15
             B       11.67 
  Total              16.67
  </code></pre>
  
  <p>Help would be much appreciated</p>