Ok. So I am having to make a scatter plot of some data in Excel 2010, which is easy to do. However, I am having to put in a horizontal line that represents the average value of the y values and also horizontal lines representing the first standard deviation and the second standard deviation away from the average. I have no idea how to do this. Please help!!! I've spent days trying to figure this out and need it done tonight.
I have attached the data and general plot so that you may see what I am talking about.
Thanks!ECHM plot.xlsx
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