question: What is the lowest week that has 7:15 p.m. as the time (cst) and fedexfield as the game site?
answer: SELECT MIN(week) FROM table_name_53 WHERE time__cst_ = "7:15 p.m." AND game_site = "fedexfield"
context: CREATE TABLE table_name_53 (week INTEGER, time__cst_ VARCHAR, game_site VARCHAR)