CREATE TABLE table_65762 ("Name" TEXT, "Nationality" TEXT, "4.30" TEXT, "4.45" TEXT, "4.55" TEXT, "Result" FLOAT)

What national has 4.45 for o and 4.55 for xo?
SELECT "Nationality" FROM table_65762 WHERE "4.45" = 'o' AND "4.55" = 'xo'
SELECT "Nationality" FROM "table_65762" WHERE "4.45" = 'o' AND "4.55" = 'xo'