UIUC engineering yield rate is 30%
215/.3 is 716 offers
716/4300 is 16% acceptance rate
Which matches the reported 15% rate for last year.
According to
https://ira.asee.org/by-the-numbers/
UIUC actually confered 503 CS bachelor degrees last year 2019. Not 215.
503/.3 is 1676
1676/4300 is 40% acceptance rate for all CS programs at UIUC. This number is in line with UIUCs 60% institutional admit rate.
The sub 10% CS admit rate for UIUC CS is a fantasy stat. The 4% rate is arrived at by 215/4300… Which is not an acceptance rate and disregards the other CS programs.