If you add 10 graded tests (each with one question each) then it will automatically do what you want. The overall score that is reported to the LMS will be the average of all tests in the title.
Or you could instead opt to adjust the score variable yourself (AICC_Score) and add 10 to it if the person gets the question right. If they get all 10 correct then the score variable will = 100 (which will be passed across as 100%).
Managing the score yourself will probably allow you more flexibility with how your tests/questions are presented within your content.