user: Question: What is the average quantity that has 1104 as the number(s)?
Columns: ['Class', 'Number(s)', 'DRG Number(s)', 'Quantity', 'Year(s) of Manufacture', 'Type']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['LE', 'I–V', '99 071–99 075', 5.0, '1885–1900', 'C n2t']
SQL:

assistant: SELECT AVG("Quantity") FROM "Table" WHERE "Number(s)" = '1104';