user: Question: What's the average year Charles N. Felton was Re-elected?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['California 1', 'Barclay Henley', 'Democratic', 1882.0, 'Retired Democratic hold']
SQL:

assistant: SELECT AVG("First elected") FROM "Table" WHERE "Result" = 'Re-elected' AND "Incumbent" = 'Charles N. Felton';