No, it's the rank that you are "clearly in" for. If you get over that mark, you are more or less guaranteed to get in. To put it another way (Certainly a more correct way), every qualified applicant over that ATAR score got in. ATAR's are not set ahead of time, its a supply and demand thing. This is why they change from year to year based on the demand for that course and the scores of the students applying for that course. Theoretically, if only people with ATARs of 60 applied for melbourne science, the clearly in would be 60.
It is possible to get accepted if you are under the clearly in but it is not a sure thing. Usually under the clearly in they take into account things like SEAS, middle band subjects, etc. Unless you're eligible for access melbourne or have a lot of SEAS, i'd advise you its not likely you'd get into a course requiring 95 with an atar of 90 or 88.