However, that is 40% of those who apply to the major after completing the prerequisite courses. They admit 200 per year. That means that 500 apply per year. But it looks like around 1,200 take the first two CSE courses, so (even after subtracting the small number of direct admit students from this number) some of them may be giving up on the CSE major before applying because their grades or GPA is too low (3.0 or whatever).