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:
| # | Air Date | Timeslot | Rating | Share | 18-49 | Viewers | Weekly Rank |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1.0 | February 22, 2008 | 9:00 P.M. | 4.6 | 8.0 | 2.4/7 | 7.44 | TBA |
| 2.0 | February 29, 2008 | 8:00 P.M. | 3.4 | 6.0 | 1.3/4 | 5.10 | TBA |
| 3.0 | March 7, 2008 | 8:00 P.M. | 3.2 | 6.0 | 1.4/5 | 4.73 | 75 |
| 4.0 | March 14, 2008 | 8:00 P.M. | 3.2 | 6.0 | 1.4/5 | 4.81 | 76 |
| 5.0 | March 21, 2008 | 8:00 P.M. | 3.5 | 7.0 | 1.3/5 | 5.15 | 64 |
| 6.0 | March 28, 2008 | 8:00 P.M. | 3.5 | 7.0 | 1.3/5 | 5.02 | 69 |
| 7.0 | April 4, 2008 | 8:00 P.M. | 3.0 | 6.0 | 1.3/4 | 4.51 | 73 |
Question:
How many episodes have a weekly rank tba and are broadcast at 8:00 p.m.?
Answer:
1.0