SELECT AVG("Week") FROM table_62476 WHERE "Result" = 'l 10–30' AND "Attendance" > '57,312'
Which Week has a Result of l 10 30, and an Attendance larger than 57,312?
CREATE TABLE table_62476 (
    "Week" real,
    "Date" text,
    "Opponent" text,
    "Result" text,
    "Game site" text,
    "Record" text,
    "Attendance" real
)