user: Question: What is the average episode number with Q146 format?
Columns: ['Episode #', 'Season #', 'Format #', 'Title', 'Original Airdate']
Types: ['real', 'real', 'text', 'text', 'text']
Sample row: [217.0, 1.0, 'H75', 'Lost Smurf', 'September 10, 1988']
SQL:

assistant: SELECT AVG("Episode #") FROM "Table" WHERE "Format #" = 'Q146';