First time at the lake. I failed at skurfing
Re: Course grade settings > Average
Group Particularly helpful Moodlers

Yes that is correct; it shows the average mark of all the students in the course for each activity to the all students.

If you don't want the students to see the average and you were just trying to get the average for the teacher to see, go to My preferences instead and activate the desired average settings in the Special Rows section.

Happy Moodle Logooodling!