user: Question: How many goals on average are there for rank 3?
Columns: ['Rank', 'Club', 'Points', 'Played', 'Victories', 'Draws', 'Defeats', 'Goals for', 'Goals against', 'Goal average']
Types: ['real', 'text', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'FC Martigues', 47.0, 34.0, 19.0, 9.0, 6.0, 53.0, 24.0, 29.0]
SQL:

assistant: SELECT AVG("Goals for") FROM "Table" WHERE "Rank" = 3.0;