CREATE TABLE table_11414 ("Name" TEXT, "Builder" TEXT, "Type" TEXT, "Date" FLOAT, "Works number" FLOAT)

What is the average work number of Snowdon Ranger with the builder Vulcan Foundry?
SELECT AVG("Works number") FROM table_11414 WHERE "Builder" = 'vulcan foundry' AND "Name" = 'snowdon ranger'
SELECT AVG("Works number") FROM "table_11414" WHERE "Builder" = 'vulcan foundry' AND "Name" = 'snowdon ranger'