Every time you offer another subject, you are spreading the student numbers too thin. If Statistics were offered as an HSC subject in its own right, then who is going to do it (useful but boring as shit) and how many teachers are going to be able to teach it, if offered? If we, as now have nearly 100 (??? - don't know the actual number), the actual cost of supporting such a programme is enormous. You will have a subject where, one year you may have 9 students doing it, and next, only 5. Imagine the cost of one teacher for a class of only 5.