Gathering Data for Scatterplots

So I am trying to gather data from students to make scatter plots, and I am struggling to get the data to aggregate. I know I need to use the computation layer, but can anyone tell me what I am missing?

Thanks in advance!

Looks like it’s probably the use of lowercase x and y, which are standard variables for functions, so may be confusing the calculator a little. Change them to capitals in the graph and CL, and it should work fine.