CREATE TABLE table_78241 ("Institution" TEXT, "City" TEXT, "State" TEXT, "Nickname" TEXT, "Joined" FLOAT, "Conference championships" FLOAT)

What is the year joined with a Conference championships of 5, and a Nickname of wolfpack?
SELECT "Joined" FROM table_78241 WHERE "Conference championships" = '5' AND "Nickname" = 'wolfpack'
SELECT "Joined" FROM "table_78241" WHERE "Conference championships" = '5' AND "Nickname" = 'wolfpack'