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:
| Dance | Best dancer | Best score | Worst dancer | Worst score |
| --- | --- | --- | --- | --- |
| Cha-cha-cha | Emmitt Smith | 30.0 | Tucker Carlson | 12.0 |
| Foxtrot | Mario Lopez Joey Lawrence | 29.0 | Sara Evans | 15.0 |
| Mambo | Emmitt Smith | 30.0 | Sara Evans | 21.0 |
| Quickstep | Joey Lawrence | 29.0 | Jerry Springer | 19.0 |
| Jive | Monique Coleman Mario Lopez | 27.0 | Joey Lawrence Willa Ford | 22.0 |
| Tango | Mario Lopez | 30.0 | Emmitt Smith | 19.0 |
| Waltz | Emmitt Smith | 29.0 | Jerry Springer | 22.0 |
| Rumba | Joey Lawrence | 30.0 | Joey Lawrence | 24.0 |
| Paso Doble | Mario Lopez | 30.0 | Jerry Springer | 18.0 |
| Samba | Emmitt Smith | 30.0 | Monique Coleman | 23.0 |
| Freestyle | Mario Lopez | 30.0 | Emmitt Smith | 29.0 |
Question:
What is the average Worst score for Mario Lopez as the Best dancer and Tango as the Dance?
Answer:
19.0