CREATE TABLE table_19838 ("Year" FLOAT, "Starts" FLOAT, "Wins" FLOAT, "Top 5" FLOAT, "Top 10" FLOAT, "Poles" FLOAT, "Avg. Start" CLOB, "Avg. Finish" CLOB, "Winnings" CLOB, "Position" CLOB, "Team ( s ) " CLOB)

What was the average finish when the average start was 18.4?
SELECT "Avg. Finish" FROM table_19838 WHERE "Avg. Start" = '18.4'
SELECT "Avg. Finish" FROM "table_19838" WHERE "Avg. Start" = '18.4'