CREATE TABLE table_41521 ("Position" TEXT, "Jersey #" FLOAT, "Name" TEXT, "Height  ( cm ) " FLOAT, "Weight  ( kg ) " FLOAT, "Birthdate" TEXT, "Birthplace" TEXT, "Previous Club/Team" TEXT)

What was the average Jersey # of Steve Griffith, when his Weight (kg) was less than 84?
SELECT AVG("Jersey #") FROM table_41521 WHERE "Name" = 'steve griffith' AND "Weight (kg)" < '84'
SELECT AVG("Jersey #") FROM "table_41521" WHERE "Name" = 'steve griffith' AND "Weight (kg)" < '84'