The information provided by the UCLA Career Center is:
For the 2013 med school entering class a total of 135 UCLA graduates applied to UCLA Geffen School of Medicine. Of those 135 applicants, 17 applicants were accepted to UCLA Geffen School of medicine. (15 of those 17 applicants actually matriculated at Geffen). 17 divided by 135 equals 13%. So if you are a UCLA graduate, you have a 13% chance of being admitted to Geffen. Overall, on the other hand, the acceptance rate for all applicants from all undergraduate schools is only 3.5% .
By the way gyngyn, where did you come up with the number of 844 for UCLA applicants to Geffen in 2013? According to the chart, only 135 UCLA graduates applied to Geffen for the 2013 entering class. For this chart's purpose, 135 does NOT refer to the number of spots in the first year class but rather to the number of UCLA graduate applicants in 2013. Coincidently, 135 MAY be the number of spots in the first year class but I do not think that is exactly accurate.