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)