user: Question: Which average Winner's share ($) has a Score of 281 (−7), and a Player of hale irwin, and a Year smaller than 1983?
Columns: ['Year', 'Player', 'Country', 'Score', 'Margin of victory', "Winner's share ( $ )"]
Types: ['real', 'text', 'text', 'text', 'text', 'real']
Sample row: [2013.0, 'Matt Kuchar', 'United States', '276 (−12)', '2 strokes', 1160000.0]
SQL:

assistant: SELECT AVG("Winner's share ( $ )") FROM "Table" WHERE "Score" = '281 (−7)' AND "Player" = 'hale irwin' AND "Year" < 1983.0;