CREATE TABLE table_36109 ("Year" FLOAT, "Player" TEXT, "Country" TEXT, "Score" TEXT, "Margin of victory" TEXT, "Winner's share  (  $  ) " FLOAT)

Which average Winner's share ($) has a Score of 281 ( 7), and a Player of hale irwin, and a Year smaller than 1983?
SELECT AVG("Winner's share ( $ )") FROM table_36109 WHERE "Score" = '281 (−7)' AND "Player" = 'hale irwin' AND "Year" < '1983'
SELECT AVG("Winner's share ( $ )") FROM "table_36109" WHERE "Player" = 'hale irwin' AND "Score" = '281 (−7)' AND "Year" < '1983'