Yes, depending on the school one is trying to reach, a particular score is needed. But even in such a case, don't settle for a score that guarantees admission; a better score can always garner scholarships.
Obviously, with an LSAT at the 75% percentile and a GPA above the 75% median i'd say your a lock for admission. I don't think anyone can truly say what $ you'd likely get. It would be decent but certainly not half or a full ride in my opinion. Good Luck :)