Question about Grapher

[Labhras]

Hi all - I'm rewriting some lecture notes and for the equation part I use grapher. I have a problem though - can't seem to find how to write a mean - you know, the little subscript hyphen above the letter indicating it as a mean of set of observation. I looked around the equation menu but can't seem to find anything like it.
Any help would be greatly appreciated

 

[MisterMe]

Grapher is a super 2-D and 3- graphing calculator. Its equation editing function to visually edit the equations that it graphs. Grapher is great for its intended purpose. However, it is not a full-function equation editor. If you require a full-function equation editor, then you need the free LaTeX-based LaTeXiT, a free installation of LaTeX, or one of several excellent commercial equation editors.