Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE customer (acc_type VARCHAR, acc_bal INTEGER, credit_score INTEGER)
### Question:
For each account type, find the average account balance of customers with credit score lower than 50.
### Answer:
SELECT AVG(acc_bal), acc_type FROM customer WHERE credit_score < 50 GROUP BY acc_type