Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_80421 ( "Year" text, "Carries" real, "Rushing Yards" real, "Average" real, "Touchdowns" real, "Points" real )

### Question ###
What is the total number of rushing yards associated with averages over 8.4 and fewer than 54 carries?

### Accurate SQL ###

SELECT COUNT("Rushing Yards") FROM table_80421 WHERE "Average" > '8.4' AND "Carries" < '54'