How can I select an area of a picture (larger than one pixel) and find the average RGB values of all the pixels contained inside the area?

I'm analysing the differences between several different images and I would like to select a large area of each (such as with lasso tool) and find the average RGB value of all of the pixels within the selection area made/

With the selection you could do a copy paste and use the histogram of the new layer set the histogram source to selected layer.  The eye dropper sample size may also to get the average  of a square area around a point.

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