CREATE TABLE table_57566 ("Coach" TEXT, "Season" TEXT, "Record" TEXT, "Home" TEXT, "Away" TEXT, "Win %" FLOAT, "Average  ( Total )  Home Attendance" TEXT)

What is the sum of all win% with average home/total attendance of 3,927 (19,633)?
SELECT SUM("Win %") FROM table_57566 WHERE "Average (Total) Home Attendance" = '3,927 (19,633)'
SELECT SUM("Win %") FROM "table_57566" WHERE "Average (Total) Home Attendance" = '3,927 (19,633)'