Those features (calculate overall average vs calculate total) are actuallyindependent from each other.
Calculation of the average is set on My Preferences/Grader report, and another instructor in the same course can set/see them differently. As for students, they will not see the average at all, since they do not have access to the Grader report.
Gradebook
1.9.5 Non-empty grades/All Grades not working
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