user: Question: What is the total number of rushing yards associated with averages over 8.4 and fewer than 54 carries?
Columns: ['Year', 'Carries', 'Rushing Yards', 'Average', 'Touchdowns', 'Points']
Types: ['text', 'real', 'real', 'real', 'real', 'real']
Sample row: ['1901', 67.0, 684.0, 10.2, 20.0, 100.0]
SQL:

assistant: SELECT SUM("Rushing Yards") FROM "Table" WHERE "Average" > 8.4 AND "Carries" < 54.0;