CREATE TABLE table_name_70 (year_named INT, latitude VARCHAR, diameter__km_ VARCHAR)

What is the average Year Named, when Latitude is 37.9N, and when Diameter (km) is greater than 76?
SELECT AVG(year_named) FROM table_name_70 WHERE latitude = "37.9n" AND diameter__km_ > 76
SELECT AVG("year_named") FROM "table_name_70" WHERE "37.9n" = "latitude" AND "diameter__km_" > 76