user: Question: How many Viewers have a Rank smaller than 2?
Columns: ['Rank', 'Series', 'Episode title', 'Viewers', 'Date']
Types: ['real', 'text', 'text', 'real', 'text']
Sample row: [1.0, 'The Sarah Jane Adventures', '"The Empty Planet (Part 1)"', 993000.0, '1 November 2010']
SQL:

assistant: SELECT SUM("Viewers") FROM "Table" WHERE "Rank" < 2.0;