Table schema:
CREATE TABLE table_name_4 (evening_gown INTEGER, average VARCHAR, interview VARCHAR, swimsuit VARCHAR)

Question: What is the sum of the evening gown scores where the interview score is less than 8.77, the swimsuit score is equal to 7.8, and the average score is less than 8.2?
SQL: SELECT SUM(evening_gown) FROM table_name_4 WHERE interview < 8.77 AND swimsuit = 7.8 AND average < 8.2