I'm not sure if this is meant to be a joke or if it's serious...
You're telling me that the Business School alone has 7k students on its own(!), the Econ department has 2.1k students on its own and the Maths department 2k students plus the postgrads. Am I reading this correctly?
Fine, now that you've ridiculed yourself, let me show you just how wrong you are:
https://www2.warwick.ac.uk/about/profile/people/In 2015, Warwick's Social Sciences Faculty corresponded to 46% of the total student population. The Social Sciences Faculty includes both the Business School and Economics, on top of: Linguistics, Lifelong Learning, Education courses, Law, Philosophy, Politics and International Studies and Sociology.
IF we take your calculations into account, Econ and the WBS ALONE would total over 10.1k students - that would mean that all remaining courses in TOTAL would have just 1300-1500 students, including both undergraduates and postgraduates. For Law alone, Warwick takes about 200 UNDERGRADUATE students a YEAR. That would mean that, if you multiply that by 3 and 4 (depending on course duration), AND add the postgraduates, the other courses would simply have no students (according to your calculations).
So, I'm asking again - is this a joke? Or is it perhaps that you're pulling numbers out of your arse?
Well well...