For example: I have a course with 20 quizzes in it. When a student gets 80% for his first quiz it will show a total percentage of 4% - which is rather meaningless. I would prefer it to show 80%. It appears that the average is calculated from the quizzes taken plus any not-taken quizzes which are graded at 0%.
If it could be re-coded to show a running percentage, of only the quizzes taken, rather than a total percentage, of the complete course, it would be of significantly more use.
Using Version 1.6.4+ the averages were correctly calculated. It was on upgrading to 1.8.2+ that the problem appeared.
I have Gradebook Plus v2_1.7 installed.