Well thats the thing. Are you referring to do SCALING (which is UAI) or MODERATING (which is Board of Studies.)
On the contrary, the amount of people has a lot to do with it, but more so is the quality of the candiature. The more people who take the course, the more likely you are going to have people who shouldn't be doing the subject doing it. Ie. there aren't many people doing Music 2 who would stick with it because its really difficult, but there are more sho are doing Music 1 who would, because its an easier subject. This is where the system becomes blatantly unfair because UAC makes jugdements about the difficulty of a course, based on the subjects the candiature does.
By the quality of the candiature, they look at the subjects the people are doing, the overall marks etc. Therefore, Economics, is likely to have people doing subjects like 4U Maths, Chemistry etc. I am not saying these people are smarter But UAC certainly seems to think so and does not value the difficult nature of subjects like Music and Drama, which is really annoying. Also, as a generalisation, many people doing Music 1 would not be doing say Chemistry or Physics. (GENERALISATION - we have no way of knowing who does what) and so, UAC then believes that GENERALLY the marks from Music 1 are lower so we push it down slightly.
I said that this should have been posted there, i didn't necessaryily say it had to be moved, if not, I would have moved it already. The point i was trying to state is, you would obtain much more informed answers about the technicalities about scaling/aligning in the Technical Arena. The other is, there are no 03ers or 02ers who frequent the Music Forum and therefore, we don't have anyone who can tell us about their experience. Sure, you have people like myself who can tell you what I've researched and from what my teachers have told me, but there is no-one in this forum who can give you solid numbers (with the exception of a new member, Phanatical who may be able to give you some figures of his own)