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_11647327_2 (head_of_household VARCHAR, single VARCHAR)
### Question:
What is the range of the head of household whereas single is $171,551–$372,950?
### Answer:
SELECT head_of_household FROM table_11647327_2 WHERE single = "$171,551–$372,950"