What is the average weight of the goods being transported on a single shipment ordered by S K L Enterprises Inc?
"S K L Enterprises Inc" is the cust_name; average = Divide (Sum(weight), Count(ship_id))
SELECT AVG(T2.weight) FROM customer AS T1 INNER JOIN shipment AS T2 ON T1.cust_id = T2.cust_id WHERE T1.cust_name = 'S K L Enterprises Inc'