CREATE TABLE table_19802 ("#" FLOAT, "Episode" TEXT, "Writer" TEXT, "Director" TEXT, "Original air date" TEXT, "Viewing figure" TEXT)

What are all episodes with a viewing figure of 6.72 million?
SELECT "Episode" FROM table_19802 WHERE "Viewing figure" = '6.72 million'
SELECT "Episode" FROM "table_19802" WHERE "Viewing figure" = '6.72 million'