The first column is rounded. My data source (Forbes [1]) had 231 for Caltech class size, which I rounded to 200. It's also a few years old.
I simply botched the second column. The second column should be relabeled "A Number Smaller Than The Number Of Applicants, Probably By A Factor of 1.2 to 4". :-)
It was calculated from the class size and the acceptance rate. I forgot that I needed to also take a look at the percentage of the admitted who enrolled, since many people are admitted to multiple schools so not all admitted to a given school enroll.
[1] http://www.forbes.com/lists/2008/94/opinions_college08_Ameri...
* http://collegeadmissions100.com/caltech-admission-stats/