CREATE TABLE table_48715 ("Institution" TEXT, "Location" TEXT, "Nickname" TEXT, "Founded" FLOAT, "Enrollment" FLOAT, "Joined" FLOAT)

Which Joined has a Nickname of knights, and an Enrollment larger than 2,960?
SELECT SUM("Joined") FROM table_48715 WHERE "Nickname" = 'knights' AND "Enrollment" > '2,960'
SELECT SUM("Joined") FROM "table_48715" WHERE "Enrollment" > '2,960' AND "Nickname" = 'knights'