CREATE TABLE table_71816 ("Date" TEXT, "Opponent" TEXT, "Score" TEXT, "Loss" TEXT, "Attendance" FLOAT, "Record" TEXT)

What was the average attendance when the New York Mets were opponents with a record of 51-33?
SELECT AVG("Attendance") FROM table_71816 WHERE "Opponent" = 'new york mets' AND "Record" = '51-33'
SELECT AVG("Attendance") FROM "table_71816" WHERE "Opponent" = 'new york mets' AND "Record" = '51-33'