The purpose of education? It's a good question. I was never asked anything that general in any interview I attended for a position in the field, but if I were I'd give a two-fold answer. First of all, ideally, the primary purpose of education is to develop and nurture the individual along the lines of his or her major talents while providing a broad base of shared skills and abilities that allow he or she to function productively and happily (in a holistic rather than simply a commercial sense) in society. However, in practice, education often functions primarily to produce individuals who fit into predetermined social slots that allow them to be productive in society (in a commercial rather than a holistic sense) regardless of their major talents or abilities.
I saw the latter philosophy at work in the last university I worked at where engineering/science and business accounted for over 75% of all courses and was growing in proportion, while the arts and humanities, and social sciences that made up the rest were continually shrinking away. Students then were being funneled into courses for economic reasons irregardless of who they were as people and who they wanted to become. Sad.