CREATE TABLE table_name_99 (week INT, opponent VARCHAR, attendance VARCHAR)

What is the average week with St. Louis Cardinals with less than 80,010 attendance?
SELECT AVG(week) FROM table_name_99 WHERE opponent = "st. louis cardinals" AND attendance < 80 OFFSET 010
SELECT AVG("week") FROM "table_name_99" WHERE "attendance" < 80 AND "opponent" = "st. louis cardinals" OFFSET 010