Write SQL query to solve given problem: Please calculate the average total price of shipped orders from German customers.. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT SUM(T3.quantityOrdered * T3.priceEach) / COUNT(T2.orderNumber) FROM customers AS T1 INNER JOIN orders AS T2 ON T1.customerNumber = T2.customerNumber INNER JOIN orderdetails AS T3 ON T2.orderNumber = T3.orderNumber WHERE T2.status = 'Shipped' AND T1.country = 'Germany'