CREATE TABLE table_1052 ("Quarterback" TEXT, "Jersey No." TEXT, "Games Started" FLOAT, "Wins" FLOAT, "Losses" FLOAT, "Ties" FLOAT, "Winning Pct." TEXT)

What is the winning pct for jersey 15?
SELECT "Winning Pct." FROM table_1052 WHERE "Jersey No." = '15'
SELECT "Winning Pct." FROM "table_1052" WHERE "Jersey No." = '15'