Math input is marked correct from a value calculated on a graph

I am trying to create a page that walks students through the steps of finding MAD, giving them feedback for each step. I want this to work with whatever list of data they input.

In step two I have a table that automatically inputs the data list that they have inputted and the mean that is to be subtracted, but I cannot figure out how to check that each answer is correct. I want the feedback to be denoted with an icon (check or x) as a cellSuffix.

How do I get the table to recognize these correct answers?

Any help would be greatly appreciated. Here is my activity so far.

Here you go. I put the calculations inside your hidden graph on screen 2.

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Thank you so much! I didnā€™t know about the c_{heck1} notation! I appreciate you teaching me.