Which week did the Seattle Seahawks have a record of 6-6?
CREATE TABLE table_15780 (
    "Week" real,
    "Date" text,
    "Opponent" text,
    "Result" text,
    "Game site" text,
    "Record" text,
    "Attendance" text
)
SELECT AVG("Week") FROM table_15780 WHERE "Record" = '6-6'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Which week did the Seattle Seahawks have a record of 6-6? ### Input: CREATE TABLE table_15780 (
    "Week" real,
    "Date" text,
    "Opponent" text,
    "Result" text,
    "Game site" text,
    "Record" text,
    "Attendance" text
) ### Response: SELECT AVG("Week") FROM table_15780 WHERE "Record" = '6-6'