Teaching with Moodle

Hi all,

i'm new to Moodle and I've encountered a problem and can't figure out where to fix it, hopefully you can help me.

I've set up a couple of tasks and test for my course, each of them with a maximum grade of 10, so each student has a grade between 0 and 10 on each task. Everything ok to this point, but the final grade once they've completed all tasks is the SUM of the tasks' grades, for example, a student is graded 6.7 on a test and 7 on a paper, I want his final grade to be 6.85, the average grade of the tasks, but Moodle sums the grades and the result is 13.7 as final grade.

I haven't been able to find where can I change this if it is possible, any ideas?

Thanks!!!