CREATE TABLE table_77488 ("Institution" TEXT, "Location" TEXT, "Founded" FLOAT, "Affiliation" TEXT, "Enrollment" FLOAT, "Nickname" TEXT)

What is the average enrollment of the Redbirds' school?
SELECT AVG("Enrollment") FROM table_77488 WHERE "Nickname" = 'redbirds'
SELECT AVG("Enrollment") FROM "table_77488" WHERE "Nickname" = 'redbirds'