CREATE TABLE table_70275 ("Episode #" FLOAT, "Title" TEXT, "Airdate" TEXT, "Viewers  ( millions ) " FLOAT, "Channel 4 weekly rank a" FLOAT)

What is the number of viewers in millions for the episode on October 10, 2008, and a Channel 4 weekly rank a smaller than 30?
SELECT COUNT("Viewers (millions)") FROM table_70275 WHERE "Airdate" = 'october 10, 2008' AND "Channel 4 weekly rank a" < '30'
SELECT COUNT("Viewers (millions)") FROM "table_70275" WHERE "Airdate" = 'october 10, 2008' AND "Channel 4 weekly rank a" < '30'