Customers With Above-Average Orders

Return the customers whose total spend is higher than the average total spend across all customers. Return customer_id and total_spent.

Table schema

Orders(id INT PRIMARY KEY, customer_id INT, amount INT)

Sample data

id | customer_id | amount
1 | 1 | 100
2 | 1 | 100
3 | 2 | 50
4 | 3 | 30