It's only what I heard, I don't have any proof. Looking at VCAA's website, it doesn't mention it either way.
It always seemed logical to me. For instance, a study score of 35 means you're in the top 26%, and a study score of 38 means you're in the top 15% (in subjects with over 1000 students). So with 3 integers, they have to represent 11% of students. That's 110 students at the very least. Their rank would be determined by three variables, and I don't think they'd all get the same, so I assumed they wouldn't be given the same SS values, either.
On the VCAA website, it mentions this:
• The ranks are then normalised using an inverse normal function. The scores resulting from this transformation are
distributed normally, with a mean of 0 and a standard deviation of 1.
• The normalised scores are then converted to a scale with a mean of 30 and a standard deviation of 7, truncated at 0 and
50. This produces a possible study score ranging from 0 to 50, with the majority of study scores between 23 and 37.
Perhaps during this process they convert all scores into integers as well, but I don't really know.
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