A cumulative activity graph rolls up the data across all targets tracked that day and people who tracked the data. For example, two targets on the activity were tracked today, One by jane doe (student score 50% 5 / 10 trials) and one by john doe (student scored 25% 1/4 trials). On the cumulative graph, the data point modal will show the average score and since there were two different data collectors, will show no person's name.

Proposed solution:

We should display which targets were tracked, the score for each target, and data collector for each target in the cumulative data point modal. I should be able to edit/delete the data for the respective target from here