All of that honestly depends on the class being taken. There are some intro courses with around 75 students in the class. I had other core courses that had as few as 10. As expected, upper level courses have fewer students in them. As a chemistry major, my upper level courses typically had around 15 students in the class. From what others told me, they had approximately the same number for their upper level classes. (P.S I graduated less than a year ago).

Reply by Steven