text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE university (enrollment INTEGER, founded INTEGER)
  ### Question:
  What are the average enrollment size of the universities that are founded before 1850?
  ### Answer:
  SELECT AVG(enrollment) FROM university WHERE founded < 1850