A common theme on this forum is that there are many smaller scholarships that may come in april after the decisions along with the deans. However, they are not listed on the freshman profile.
for example from the top scholarship thread madbean says "From personal observation, this isn't always the news many applicants would wish for, but many of the excellent candidates who are not interviewed will actually be awarded a Dean's Scholarship, a notification which comes with the end-of-March admissions packets. A Dean's is worth 1/4 tuition for 4 years. There are other, smaller, scholarships which are also awarded at that end-of-March date as well."
Looking at the profile for simplicity lets assume 1000 candidates are invited to interview and there are 489 that enroll out of the presidential on up. That is a yield of roughly 50% for the scholarship awardees. Taking that same yield for the deans and the other scholarships that is 412 other scholarship deans and otherwise. Divided by the 27000 I think applicants that applied before the merit deadline is a small scholarship award rate of 1.52%. Which is not exactly a ton of scholarships and even within the other scholarships some of those are awarded to other scholarship awardees so it is in reality even less. I don't really know what my point is but I guess the question is are the other scholarships people talk about departmental? Otherwise the chance of getting any merit money if you didn't get a big packet or are NMF are even smaller than the original 3.7% or so of applicants that get the big packets.
edit: Looking at the scholarship PDF it says that 250 deans are awarded. I originally interpreted those numbers on that PDF as the -estimated- amount that usc wants to enroll not the number that are offered to the students. For example there are more mork and trustee in the freshman profile than there are on the PDF. The presidential gets complicated with the NMF so those numbers are strange. But for the deans only 156 enrolled last year and 100 the year before which leads to me that the yield for the deans is significantly lower, around the general 31% or even lower than that because many applicants would get that amount in FA anyways and many applicants that would have gotten are high caliber and might have better offers both school wise and financially elsewhere and the 1/4 award is not enough to woo them. So I think the number of deans awarded is actually around 500.....