CREATE TABLE table_name_50 (population NUMBER, rank VARCHAR2, median_house__hold_income VARCHAR2)

What is the population where the rank is higher than 51 and the Median House-hold income is $25,250?
SELECT SUM(population) FROM table_name_50 WHERE rank > 51 AND median_house__hold_income = "$25,250"
SELECT SUM("population") FROM "table_name_50" WHERE "$25,250" = "median_house__hold_income" AND "rank" > 51