text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_name_6 (decile INTEGER, roll INTEGER)
  ### Question:
  How many decile has a roll less than 20?
  ### Answer:
  SELECT AVG(decile) FROM table_name_6 WHERE roll < 20