user: ### NOW ANSWER:
Question: Which Quantity has an Axle arrangement of 2′C h2?
Columns: ['Class', 'Railway number(s)', 'DRG number(s)', 'Quantity', 'Year(s) of manufacture', 'Axle arrangement']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['P 4 1', '107–111, 116, 129–134, 139–144, 150', '36 1201–1219', 19.0, '1896–1902', '2′B n2']
SQL:

assistant: SELECT AVG("Quantity") FROM "Table" WHERE "Axle arrangement" = '2′C h2';