title: Can I add an "average" line to Highcharts Chart?
body: <p>I'm trying to recreate a chart (the one below) using <a href="http://www.highcharts.com/demo/bar-basic" rel="noreferrer">Highcharts</a>.  I'm using a basic bar chart, and I'm wondering if there is a way to get a vertical line showing the average of all the bars?  I have the value calculated, I just need it to display as the picture shows.  Can I do this using Highcharts?</p>
  
  <p><img src="https://i.stack.imgur.com/wCxFz.png" alt="enter image description here"></p>