I do not know how to have correct averages in my gradebook. To enter grades, I go to my class, to the topic, and make sure that editing is on. Then I add an offline activity. I use all of the default options, with the exception of the grade. The grade depends on the activity. No grade is above a 100.
Currently, none of my student's averages are correct. For progress reports, I have had to export my grades into excel and perform my averages myself (total points earned/total possible points).
Why isn't moodle doing this simple average?