Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Week | Date | Opponent | Result | Attendance |
| --- | --- | --- | --- | --- |
| 1.0 | September 26, 1954 | at San Francisco 49ers | L 41-7 | 32085.0 |
| 2.0 | October 2, 1954 | at Pittsburgh Steelers | L 37-7 | 22492.0 |
| 3.0 | October 10, 1954 | New York Giants | L 51-21 | 21217.0 |
| 4.0 | October 17, 1954 | Philadelphia Eagles | L 49-21 | 22051.0 |
| 5.0 | October 24, 1954 | at New York Giants | L 24-7 | 22597.0 |
| 6.0 | October 31, 1954 | Baltimore Colts | W 24-21 | 23567.0 |
| 7.0 | November 7, 1954 | at Cleveland Browns | L 62-3 | 25158.0 |
| 8.0 | November 14, 1954 | Pittsburgh Steelers | W 17-14 | 19388.0 |
| 9.0 | November 21, 1954 | at Chicago Cardinals | L 38-16 | 15619.0 |
| 10.0 | November 28, 1954 | at Philadelphia Eagles | L 41-33 | 18517.0 |
| 11.0 | December 5, 1954 | Cleveland Browns | L 34-14 | 21761.0 |
| 12.0 | December 12, 1954 | Chicago Cardinals | W 37-20 | 18107.0 |
Question:
What is the average week that there was a game with less than 18,517 fans attending and occurred on November 21, 1954?
Answer:
9.0