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 table_name_86 (quantity INTEGER, axle_arrangement VARCHAR)
### Question:
Which Quantity has an Axle arrangement of 2′c h2?
### Answer:
SELECT AVG(quantity) FROM table_name_86 WHERE axle_arrangement = "2′c h2"