user: Question: 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?
Columns: ['Episode #', 'Title', 'Airdate', 'Viewers (millions)', 'Channel 4 weekly rank a']
Types: ['real', 'text', 'text', 'real', 'real']
Sample row: [24.0, '"How Betty Got Her Grieve Back', 'October 5, 2007', 2.82, 1.0]
SQL:

assistant: SELECT "Viewers (millions)" FROM "Table" WHERE "Airdate" = 'october 10, 2008' AND "Channel 4 weekly rank a" < 30.0;