CREATE TABLE table_name_20 (b_score NUMBER, gymnast VARCHAR2)

what is the average b score when the gymnast is k hei uchimura ( jpn )?
SELECT AVG(b_score) FROM table_name_20 WHERE gymnast = "kōhei uchimura ( jpn )"
SELECT AVG("b_score") FROM "table_name_20" WHERE "gymnast" = "kōhei uchimura ( jpn )"