That's more like the typical engineering school format. I went to a Liberal Arts university, nearly half my classes were general humanities and sciences. The rest were in my major (also required an additional 18-21 credits for the ABET accredited degree option).

This makes sense, as you get your broad education before university. School focusses on a well-rounded education, whereas universities let you specialise. I realise this is a bit of a contrast to the US education system, with majors and minors, etc.