For Division I athletes the NCAA uses a sliding scale, based on both core GPA and the combined Mathematics and Critical Reading SAT score, to determine eligibility to compete in the first year of college. For athletes with a core GPA of 3.0, a score of at least 620 on the combined Mathematics and Critical Reading sections of the SAT exam is required. In 2011, the combined scores of the millions of college-bound seniors taking the SATs were approximately Normal with mean 1012 and standarddeviation approximately 213.[x] % of all SAT scores of college-bound seniors are less than 620.