CREATE TABLE table_name_21 (points INT, laps VARCHAR, team VARCHAR, grid VARCHAR)

How many average points did the team Minardi Team USA have when there was a grid 3 and more laps than 68?
SELECT AVG(points) FROM table_name_21 WHERE team = "minardi team usa" AND grid = 3 AND laps > 68
SELECT AVG("points") FROM "table_name_21" WHERE "grid" = 3 AND "laps" > 68 AND "minardi team usa" = "team"