CREATE TABLE table_65188 ("Class" CLOB, "Railway number ( s ) " CLOB, "DRG number ( s ) " CLOB, "Quantity" FLOAT, "Year ( s )  of manufacture" CLOB, "Axle arrangement" CLOB)

Which Quantity has an Axle arrangement of 2 c h2?
SELECT AVG("Quantity") FROM table_65188 WHERE "Axle arrangement" = '2′c h2'
SELECT AVG("Quantity") FROM "table_65188" WHERE "Axle arrangement" = '2′c h2'