From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ken Williams <ken.williams@thomsonreuters.com>
Subject: Re: calculating column averages
Date: Fri, 22 Jul 2011 21:48:55 +0000 (UTC)
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Jude DaShiell <jdashiel <at> shellworld.net> writes:

> 
> In this case I don't want to tell org-mode how many rows to calculate, and 
> I put a table together with an averages line in its own footer section.  

Since you have a header & footer, one solution is to use a formula like this:

   :=vmean(@I..@II)

 -Ken