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 | Game Site | Final Score | Record | TV Time | Attendance |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1.0 | September 1, 1991 | Miami Dolphins | Rich Stadium | W 35–31 | 1–0 | NBC 4:15pm | 80,252 |
| 2.0 | September 8, 1991 | Pittsburgh Steelers | Rich Stadium | W 52–34 | 2–0 | NBC 1:00pm | 79,545 |
| 3.0 | September 15, 1991 | at New York Jets | The Meadowlands | W 23–20 | 3–0 | NBC 4:15pm | 65,309 |
| 4.0 | September 22, 1991 | at Tampa Bay Buccaneers | Tampa Stadium | W 17–10 | 4–0 | NBC 4:15pm | 57,323 |
| 5.0 | September 29, 1991 | Chicago Bears | Rich Stadium | W 35–20 | 5–0 | CBS 1:00pm | 80,366 |
| 6.0 | October 7, 1991 | at Kansas City Chiefs | Arrowhead Stadium | L 6–33 | 5–1 | ABC 9:00pm | 76,120 |
| 7.0 | October 13, 1991 | Indianapolis Colts | Rich Stadium | W 42–6 | 6–1 | NBC 1:00pm | 79,015 |
| 8.0 | October 21, 1991 | Cincinnati Bengals | Rich Stadium | W 35–16 | 7–1 | ABC 9:00pm | 80,131 |
| 9.0 | Bye | Bye | Bye | Bye | Bye | Bye | Bye |
| 10.0 | November 3, 1991 | New England Patriots | Rich Stadium | W 22–17 | 8–1 | NBC 1:00pm | 78,278 |
| 11.0 | November 10, 1991 | at Green Bay Packers | Milwaukee County Stadium | W 34–24 | 9–1 | NBC 1:00pm | 52,175 |
| 12.0 | November 18, 1991 | at Miami Dolphins | Joe Robbie Stadium | W 41–27 | 10–1 | ABC 9:00pm | 71,062 |
| 13.0 | November 24, 1991 | at New England Patriots | Foxboro Stadium | L 13–16 | 10–2 | NBC 1:00pm | 47,053 |
| 14.0 | December 1, 1991 | New York Jets | Rich Stadium | W 24–13 | 11–2 | NBC 1:00pm | 80,243 |
| 15.0 | December 8, 1991 | at Los Angeles Raiders | Los Angeles Memorial Coliseum | W 30–27 | 12–2 | NBC 4:15pm | 85,081 |
| 16.0 | December 15, 1991 | at Indianapolis Colts | Hoosier Dome | W 35–7 | 13–2 | ESPN 8:15pm | 48,286 |
| 17.0 | December 22, 1991 | Detroit Lions | Rich Stadium | L 14–17 | 13–3 | CBS 1:00pm | 78,059 |
Question:
What average week number had the Chicago bears as the opponent?
Answer:
5.0