user: Question: What was the average Jersey # of steve griffith, when his Weight (kg) was less than 84?
Columns: ['Position', 'Jersey #', 'Name', 'Height (cm)', 'Weight (kg)', 'Birthdate', 'Birthplace', 'Previous Club/Team']
Types: ['text', 'real', 'text', 'real', 'real', 'text', 'text', 'text']
Sample row: ['G', 29.0, 'Marc Behrend', 185.0, 84.0, '11 January 1961', 'Madison, Wisconsin', 'University of Wisconsin']
SQL:

assistant: SELECT AVG("Jersey #") FROM "Table" WHERE "Name" = 'steve griffith' AND "Weight (kg)" < 84.0;