Calculate the total quantity ordered for 18th Century Vintage Horse Carriage and the average price.
18th Century Vintage Horse Carriage is a product name; average price = AVG(priceEach);
SELECT SUM(T2.quantityOrdered) , SUM(T2.quantityOrdered * T2.priceEach) / SUM(T2.quantityOrdered) FROM products AS T1 INNER JOIN orderdetails AS T2 ON T1.productCode = T2.productCode WHERE T1.productName = '18th Century Vintage Horse Carriage'