What are the chances of a 13 year old surviving stage 4 neuroblastoma?

Not great. Make every day precious, no matter what cards you're dealt during your earthly days...
Unfortunately low. Make sure he/she is being treated at a pediatric oncology center that is part of the children's oncology group. Given the staging and age of the patient, it is essential that he/she has an oncologist who specializes in neuroblastoma or is in close contact with someone who is.
Depends. A lot depends on the stage and cell type of the neuroblastoma. This will affect it's response to chemotherapy.