EASIEST.
In Word 2007, On the 'Insert' Ribbon go to 'Equation' and choose
'Insert New Equation' from the drop down menu.
The 'Design' ribbon pops-up automatically
Choose 'Accent' button on right.
The bar accent is in the 3rd row, 2nd column.
Now you can p bar, x bar...whatever bar
or y hat
symbols like sigma, alpha, beta can be found on design ribbon as well.
Another method is to insert it as a field. Press CTRL+F9 , and then copy and paste the following into the braces that appear.
EQ \O(x,ˉ)
You can also insert an overbar directly into the Field dialog by pressing Alt+0175 (using the keys on the numeric keypad only-not the top number row). After doing this, click on the field, which will be shaded in grey, and press Shift F9 to view the result.
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