user: Question: How many episodes in the season had 3.81 million US viewers?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'U.S. viewers (million)', 'Original air date']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [15.0, 1.0, '"Withdrawal"', 'Tim Matheson', 'Jeff Eastin', '4.29', 'July13,2010']
SQL:

assistant: SELECT COUNT("No. in season") FROM "Table" WHERE "U.S. viewers (million)" = '3.81';