user: Question: What is the average number for a final episode featuring Maxine Valera?
Columns: ['Character', 'Position', 'Actor', 'First Episode', 'Final Episode', 'Duration', 'Final Episode Count']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['Dr. Tom Loman', 'Medical Examiner', 'Christian Clemenson', '"Bolt Action"', '"Habeas Corpse"', '08x03–10x19', 52.0]
SQL:

assistant: SELECT AVG("Final Episode Count") FROM "Table" WHERE "Character" = 'Maxine Valera';