user: ### NOW ANSWER:
Question: when was Lawrence Academy at Groton established? 
Columns: ['School', 'Mascot', 'Location', 'Founded', 'Entered ISL', 'Grades', 'Number of Students', 'Varsity Teams']
Types: ['text', 'text', 'text', 'real', 'real', 'text', 'text', 'real']
Sample row: ['Belmont Hill School', 'No Mascot (Sextant is school symbol)', 'Belmont, MA', 1923.0, 1948.0, '7-12', '420 Boys', 16.0]
SQL:

assistant: SELECT MIN("Founded") FROM "Table" WHERE "School" = 'Lawrence Academy at Groton';