title: Drawing an xbar and R chart using qcc package in R program
body: <p>The following data shows the average (<code>xbar</code>) and range (<code>r</code>) for 6
  samples of size 5 each.</p>
  
  <pre><code>xbar &lt;- c(1080͵1390͵1460͵1380͵1090͵1230)
     r &lt;- c(420͵670͵180͵320͵70͵690)
  </code></pre>
  
  <p>how can we draw an <code>xbar</code> and <code>r</code> chart using this kind of data using qcc package of R program?
  (<strong>Here we don't have individual observations of the sample but only their means and R values.</strong>)</p>