Thanks for your help. Have a good day!!!

"Bernard Liengme" wrote:

To find 3*stdev use =3*STDEV(A1:20) ; adjust the range as needed

Look here for how to add horizontal lines to chart:
http://peltiertech.com/Excel/Charts/...nColChart.html
--
Bernard V Liengme
Microsoft Excel MVP
http://people.stfx.ca/bliengme
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"patiencescientist" wrote in
message ...
Thanks for answering so quickly I have data where I need to firgure out
the
standard deviation, then to plot the data with +3 standard deviations
and
-3 standard deviation

"patiencescientist" wrote:

How do I graph a plot with 3 standard deviations