user: Question: What is the decile sum with a roll smaller than 25, and Franz Josef area?
Columns: ['Name', 'Years', 'Area', 'Authority', 'Decile', 'Roll']
Types: ['text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['Fox Glacier School', '1–8', 'Fox Glacier', 'State', 8.0, 25.0]
SQL:

assistant: SELECT SUM("Decile") FROM "Table" WHERE "Roll" < 25.0 AND "Area" = 'Franz Josef';