CREATE TABLE table_name_55 (decile VARCHAR(255), roll VARCHAR(255), area VARCHAR(255), name VARCHAR(255))
What was the decile of Samuel Marsden Collegiate School in Whitby, when it had a roll higher than 163?
    
SQL: SELECT COUNT(decile) FROM table_name_55 WHERE area = "whitby" AND name = "samuel marsden collegiate school" AND roll > 163