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 4, 1978 | Baltimore Colts | W 38–0 | 64224.0 |
| 2.0 | September 10, 1978 | at New York Giants | W 34–24 | 73265.0 |
| 3.0 | September 17, 1978 | at Los Angeles Rams | L 27–14 | 65749.0 |
| 4.0 | September 24, 1978 | St. Louis Cardinals | W 21–12 | 62760.0 |
| 5.0 | October 2, 1978 | at Washington Redskins | L 9–5 | 55031.0 |
| 6.0 | October 8, 1978 | New York Giants | W 24–3 | 63420.0 |
| 7.0 | October 15, 1978 | at St. Louis Cardinals | W 24–21 | 48991.0 |
| 8.0 | October 22, 1978 | Philadelphia Eagles | W 14–7 | 60525.0 |
| 9.0 | October 26, 1978 | Minnesota Vikings | L 21–10 | 61848.0 |
| 10.0 | November 5, 1978 | at Miami Dolphins | L 23–16 | 69414.0 |
| 11.0 | November 12, 1978 | at Green Bay Packers | W 42–14 | 55256.0 |
| 12.0 | November 19, 1978 | New Orleans Saints | W 27–7 | 57920.0 |
| 13.0 | November 23, 1978 | Washington Redskins | W 37–10 | 64905.0 |
| 14.0 | December 3, 1978 | New England Patriots | W 17–10 | 63263.0 |
| 15.0 | December 10, 1978 | at Philadelphia Eagles | W 31–13 | 64667.0 |
| 16.0 | December 17, 1978 | at New York Jets | W 30–7 | 52532.0 |
Question:
What's the mean week number for November 12, 1978?
Answer:
11.0