user: Question: What was the decile of samuel marsden collegiate school in whitby, when it had a roll higher than 163?
Columns: ['Name', 'Gender', 'Area', 'Authority', 'Decile', 'Roll']
Types: ['text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['Adventure School', 'Coed', 'Whitby', 'State', 10.0, 406.0]
SQL:

assistant: SELECT "Decile" FROM "Table" WHERE "Area" = 'whitby' AND "Name" = 'samuel marsden collegiate school' AND "Roll" > 163.0;