CREATE TABLE table_name_49 (year INT, quantity VARCHAR, gwr_numbers VARCHAR)

What is the average Year that has a Quantity of 10, and a GWR Numbers of 409, 290, 315, 317 321, 324, 333?
SELECT AVG(year) FROM table_name_49 WHERE quantity = 10 AND gwr_numbers = "409, 290, 315, 317–321, 324, 333"
SELECT AVG("year") FROM "table_name_49" WHERE "409, 290, 315, 317–321, 324, 333" = "gwr_numbers" AND "quantity" = 10