CREATE TABLE table_38780 ("Team" TEXT, "Stadium" TEXT, "Capacity" FLOAT, "Highest" FLOAT, "Lowest" FLOAT, "Average" FLOAT)

Highest smaller than 3,378, and a Stadium of cappielow has what average capacity?
SELECT AVG("Capacity") FROM table_38780 WHERE "Highest" < '3,378' AND "Stadium" = 'cappielow'
SELECT AVG("Capacity") FROM "table_38780" WHERE "Highest" < '3,378' AND "Stadium" = 'cappielow'