CREATE TABLE table_15780 ("Week" FLOAT, "Date" CLOB, "Opponent" CLOB, "Result" CLOB, "Game site" CLOB, "Record" CLOB, "Attendance" CLOB)

Which week did the Seattle Seahawks have a record of 6-6?
SELECT AVG("Week") FROM table_15780 WHERE "Record" = '6-6'
SELECT AVG("Week") FROM "table_15780" WHERE "Record" = '6-6'