class mark vs class average

[Alastriss]

DO US schools often do this? I would have the class average on my transcript and the distribution, but a lot of the class averages are really high..like around high 70s to 80, but some of those classes u needed to have a certain average to get into, so there is a selective bias which could make it look like its an easy class when it just happens that a lot of people in it are smart..would this be a problem for US schools in terms of devaluing a high gpa? I dont think it would matter as much for canadian schools..maybe Ucalgary and UT who actually look at the program but thats it

 

any thoughts/suggestions?