user: Question: How many values for founded when enrollment is 850?
Columns: ['School', 'Location', 'Enrolment', 'Founded', 'Denomination', 'Boys/Girls', 'Day/Boarding', 'School Colors']
Types: ['text', 'text', 'real', 'real', 'text', 'text', 'text', 'text']
Sample row: ['Annesley College', 'Wayville', 530.0, 1902.0, 'Uniting Church', 'Girls', 'Day & Boarding', 'Maroon & White']
SQL:

assistant: SELECT COUNT("Founded") FROM "Table" WHERE "Enrolment" = 850.0;