Waiting list questions

I have been put into the waiting list of Rice. I have several questions about Rice’s waiting list:

  1. Do I have to write a letter of continued interest to the admission office to increase my chances?
  2. What are the chances for a student to be admitted through the waiting list?
  3. Is there any one who has been admitted to Rice through a waiting list? Can you tell me what to do to increase my chances?