user: Question: Which Enrollment has a Primary Conference of Mid-Hoosier, and a County of 16 Decatur, and an IHSAA Class of AA?
Columns: ['School', 'Location', 'Mascot', 'Enrollment', 'IHSAA Class', 'County', 'Primary Conference']
Types: ['text', 'text', 'text', 'real', 'text', 'text', 'text']
Sample row: ['Eastern Hancock', 'Charlottesville', 'Royals', 348.0, 'A', '30 Hancock', 'Mid-Hoosier']
SQL:

assistant: SELECT "Enrollment" FROM "Table" WHERE "Primary Conference" = 'Mid-Hoosier' AND "County" = '16 Decatur' AND "IHSAA Class" = 'AA';