query: SELECT avg(enrollment) FROM university WHERE founded  <  1850
question: What-all does be a average a enrollment a size a university them which what are a-founded 1850?
query_toks: SELECT avg ( enrollment ) FROM university WHERE founded < 1850
query_toks_no_value: select avg ( enrollment ) from university where founded < value
question_toks: What-all does be a average a enrollment a size a university them which what are a-founded 1850?