What is the average year joined of the 277 county?
CREATE TABLE table_name_43 (year_joined INTEGER, county VARCHAR)
SELECT AVG(year_joined) FROM table_name_43 WHERE county = 277
### Context: CREATE TABLE table_name_43 (year_joined INTEGER, county VARCHAR) ### Question: What is the average year joined of the 277 county? ### Answer: SELECT AVG(year_joined) FROM table_name_43 WHERE county = 277