user: Question: What is the average against of murrayfield, edinburgh?
Columns: ['Opposing Teams', 'Against', 'Date', 'Venue', 'Status']
Types: ['text', 'real', 'text', 'text', 'text']
Sample row: ['Australia', 11.0, '02/01/1982', 'Twickenham , London', 'Test Match']
SQL:

assistant: SELECT AVG("Against") FROM "Table" WHERE "Venue" = 'murrayfield, edinburgh';