Computational Finance is a joint program between several schools at CMU. One of those is Mellon College of Science. Looking at Mellon College of Science admissions, for this year, average SAT was 1480/1600 and GPA was 3.86. http://admission.enrollment.cmu.edu/pages/undergraduate-admission-statistics. Acceptance rate was 20%
For Stern, in 2014, average SAT was 1432/1600 and GPA was 3.9. http://www.stern.nyu.edu/programs-admissions/undergraduate/stern-advantage/profile. Acceptance rate was 15%