user: Question: What is the average first elected year that has a district of 11 and a committee of Environmental Matters?
Columns: ['District', 'Counties Represented', 'Party', 'First Elected', 'Committee']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['05.2 5B', 'Carroll, Baltimore County', 'Republican', 1974.0, 'Health and Government Operations']
SQL:

assistant: SELECT AVG("First Elected") FROM "Table" WHERE "District" = '11' AND "Committee" = 'Environmental Matters';