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I have the following scatter plot in Google Sheets and I would like to add a line that averages all my points.

Plot example

Can I do that and if yes, how?

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    Have you seen my answer? Does it answer your question? If no, can please give me some feedback on how to answer your question more properly? – Jacob Jan Tuinstra Dec 11 '12 at 21:00
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First, calculate the linear regression factors: y=ax+b with the following formula:

=LINEST(B2:B21;A2:A21)

Then add another column next to the y-axis and name it calculated y-axis. Build the following formula to calc. the y-axis and copy that for all x-values.:

=$D$3*A2+$E$3

Next is a piece of cake. Add the calculated y-axis to the existing data range or add it seperately.

UPDATE: I've added the calculated mean value as well, in order to be absolutely sure to have answered your question properly, see plot: Plot with mean and linear regression

See example file for more details: plot regression example

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