What are the average enrollment size of the universities that are founded before 1850?
CREATE TABLE university (enrollment INTEGER, founded INTEGER)
SELECT AVG(enrollment) FROM university WHERE founded < 1850
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE university (enrollment INTEGER, founded INTEGER) Question: What are the average enrollment size of the universities that are founded before 1850? [/INST] SELECT AVG(enrollment) FROM university WHERE founded < 1850 </s>