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_13 (against INTEGER, venue VARCHAR)
### Question:
What is the average against of Murrayfield, Edinburgh?
### Answer:
SELECT AVG(against) FROM table_name_13 WHERE venue = "murrayfield, edinburgh"