> I cant imagine how low the completion rate would be for a whole degree assuming it would consist of somewhere around 20-40 classes Nowhere near as low as 10^

> I cant imagine how low the completion rate would be for a whole degree assuming it would consist of somewhere around 20-40 classes Nowhere near as low as 10^-20 to 10^-40, since completion of each course is most likely extremely not independent (i.e. if someone finishes 4 courses, they are likely to finish 10).