I have had two requests from parents that have had the class average information for each assignment available to them at previous schools. The parents say the information is important to them when evaluating their child's performance. This information is made available to teachers in chart form when they click on a student's name in the grade book. Parents see the same chart, with the exception of the class average for the individual assignments, when they click on one of the green grade books in their child's progress page.
Especially since the grades detail still has a "student" indicator and no others, it implies there should be something else to compare their child to.
This should also include advisors or anyone given access to the student progress.