Can you add an "average" line on a radar chart?

[#1]

Hey guys - was wondering if you can add an "average" line, on a radar chart?

I have about 5 metrics on this radar chart, and I would like to also add a 6th, which averages the 5 metrics on the chart.

I've attached my radar chart for example...  is there a way to have Qlikview average the lines, and add that as an additional line? Or could I perhaps average them somehow in the data itself, and then pull that data in?

Thanks for any help!

[Gysbert_Wassenaar]

Probably. I can't be sure without looking at your data. See attached example.

[#3]

This is great, thank you Gysbert!  I am working on something similar.  However, I have two dimensions and just one expression set up thus far.  How should I adjust the formula accordingly?  Basically I am trying to add the average line that should be the average of the three lines shown at each point on the x-axis.