user: Question: How many values for decile occur in mount roskill with monte cecilia school with a roll greater than 170?
Columns: ['Name', 'Years', 'Gender', 'Area', 'Authority', 'Decile', 'Roll']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['Christ The King School', '1–8', 'Coed', 'Mount Roskill', 'State', 3.0, 152.0]
SQL:

assistant: SELECT COUNT("Decile") FROM "Table" WHERE "Area" = 'mount roskill' AND "Name" = 'monte cecilia school' AND "Roll" > 170.0;