Table: jets_1979_season
Columns: week
date
opponent
result
game_site
attendance

Question: What is the result when 13 is the week?
SQL: SELECT "result" FROM jets_1979_season WHERE "week" = 13

Question: What average week has shea stadium as the game site, and 1979-12-09 as the date?
SQL: SELECT AVG("week") FROM jets_1979_season WHERE "game_site" = 'shea stadium' AND "date" = '1979-12-09'