CREATE TABLE table_57930 ("Episode" TEXT, "Air Date" TEXT, "Rating" FLOAT, "Share" FLOAT, "Rating/Share 18\\u201349" TEXT, "Viewers  ( m ) " FLOAT, "Timeslot Rank" FLOAT, "Night Rank" TEXT, "Overall Rank" FLOAT)

What is the rank of the episode with a share of 6 and timeslot rank smaller than 4?
SELECT AVG("Overall Rank") FROM table_57930 WHERE "Share" = '6' AND "Timeslot Rank" < '4'
SELECT AVG("Overall Rank") FROM "table_57930" WHERE "Share" = '6' AND "Timeslot Rank" < '4'