Hi,
The following pages have examples of how to add lines.
http://peltiertech.com/Excel/Charts/AddLine.html
http://tushar-mehta.com/excel/charts/straight_lines/index.html
http://www.andypope.info/charts/averageline.htm
http://www.processtrends.com/pg_charts_horizontal_line.htm
I think formula is the only way to determine SD.
Cheers
Andy
> Hey all
> I have this line chart (with one series) and that I need to put upper
[quoted text clipped - 3 lines]
> Thanks
> -beth

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Andy Pope, Microsoft MVP - Excel
http://www.andypope.info