What is the monthly average number of products shipped via Federal Shipping for the year 1996?
monthly average number of products refers to DIVIDE(SUM(OrderID), 12); shipped via Federal Shipping refers to CompanyName = 'Federal Shipping'; for the year 1996 refers to year(ShippedDate) = 1996
SELECT CAST(SUM(T1.ShipVia) AS REAL) / 12 FROM Orders AS T1 INNER JOIN Shippers AS T2 ON T1.ShipVia = T2.ShipperID WHERE T2.CompanyName = 'Federal Shipping' AND T1.ShippedDate LIKE '1996%'