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I couldn't think of a better title, but here's what I have:

I want a graph of X and Y, but when there's multiple Y values for an X value, I want it to plot the average of the Y values.

Here's what I've tried:

I noticed that if I have two identical X,Y pairs, the graph will show them as a single point - so if I can create a column that averages out the Y values for the same X, I can graph that and get what I want (although I haven't been able to do that either).

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Create a new column called "Average Y"

In the first cell, use the following formula: =AVERAGEIF(A:A,A1,B:B)

Where A is your column of X values and B is your column of Y values.

In the same table as OP, result looks like:

enter image description here

And your resulting graph looks as expected (no duplicate points): enter image description here

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