SELECT avg(price) FROM products WHERE Manufacturer  =  2
Compute the average price of all products with manufacturer code equal to 2.
[Schema (values) (types)]: | manufactory_1 |  Manufacturers : code (text) , name (number) , headquarter (text) , founder (text) , revenue (text) | Products : code (text) , name (number) , price (text) , manufacturer (text);