Combine Required and Optional Results for an Average Score

I have created a course with 10 different Results pages...

  • The first two quizzes and results are required of all users
  • all users can choose one of the other eight they want to complete
  • all users might choose to complete more than one of the eight, so I need to allow for that as well

My challenge is in creating a single average score representing their unique combination of courses. To calculate their average, I need a way to count only the ones they complete, not "all questions" or "all results slides". Ideas, please? 

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