CREATE TABLE table_64490 ("Japanese Title" TEXT, "Romaji Title" TEXT, "TV Station" TEXT, "Episodes" FLOAT, "Average Ratings" TEXT)

For the Japanese title that had 11 episodes, what is the average ratings?
SELECT "Average Ratings" FROM table_64490 WHERE "Episodes" = '11' AND "Japanese Title" = 'サプリ'
SELECT "Average Ratings" FROM "table_64490" WHERE "Episodes" = '11' AND "Japanese Title" = 'サプリ'