Trouble with aggregate

Boy I struggle with aggregating! Here is a link to an activity I am working on but can’t get the aggregate function working. Really appreciate the help!

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Looks like you’ve got it right! Made a class code and three sample students. Got this

Are you trying it in preview? Aggregation can misbehave a little there. Best way to test is to create a sample class and load some fake students in an incognito window.

Yep, was trying it in preview. I think I have done it like that in the past and it worked-- did not try it this time with fake students. TY. (Again:)