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:
| Date | Visitor | Score | Home | Record | Attendance |
| --- | --- | --- | --- | --- | --- |
| September 30 | Cleveland Browns | 24-10 | San Francisco 49ers | 1-0-0 | 48263.0 |
| October 6 | San Francisco 49ers | 21-14 | Philadelphia Eagles | 1-1-0 | 23827.0 |
| October 14 | San Francisco 49ers | 28-24 | Pittsburgh Steelers | 2-1-0 | 27124.0 |
| October 21 | San Francisco 49ers | 13-7 | Chicago Bears | 2-2-0 | 42296.0 |
| October 28 | Los Angeles Rams | 44-17 | San Francisco 49ers | 3-2-0 | 49538.0 |
| November 4 | San Francisco 49ers | 23-16 | Los Angeles Rams | 3-3-0 | 54346.0 |
| November 11 | New York Yanks | 19-14 | San Francisco 49ers | 4-3-0 | 25538.0 |
| November 18 | Chicago Cardinals | 27-21 | San Francisco 49ers | 4-4-0 | 19658.0 |
| November 25 | San Francisco 49ers | 10-10 | New York Yanks | 4-4-1 | 10184.0 |
| December 2 | San Francisco 49ers | 20-10 | Detroit Lions | 5-4-1 | 46467.0 |
| December 9 | Green Bay Packers | 31-19 | San Francisco 49ers | 6-4-1 | 15121.0 |
| December 16 | Detroit Lions | 21-17 | San Francisco 49ers | 7-4-1 | 27276.0 |
Question:
What was the average attendance when Chicago Bears were the home team?
Answer:
42296.0