You can see what fonts are installed and their character sets and
look for ones that might work by using the utility:

%SystemRoot%\System32\charmap.exe

Just looking through the fonts on my system I could find Abar
and a Ybar. Did not see an Xbar. If appropriate you could change
to greek mu to denote an average.

Charmap will popup and you can copy from it to your application.

Also http://www.mathtype.com/en/dl/fonts/ will let you download
a set of fonts if you can't find an math fonts on your system.

Pieter Vandenberg

Jerry W. Lewis wrote:
: That type of formatting is not supported in Excel, but there are some
: fonts that have xbar in them

: xbar is Alt-0214 in the Math Ext font from
: http://www.columbia.edu/~em36/wpdos/wptoword.html
: xbar is Alt-0120 in the MS Reference 1 font

: For equations, the Equation editor is easier and more flexible
: (Insert|Object|Microsoft Equation).

: Jerry

: gpktm wrote:

: How do I add symbols above the letters?
:
: For example the symbol of average values (xaverage = x with a dash
: above it)