What is the total enrollment for private/ disciples of christ?
CREATE TABLE "division_i" (
  "institution" text,
  "location" text,
  "founded" real,
  "affiliation" text,
  "enrollment" real,
  "team_nickname" text,
  "primary_conference" text
);
SELECT "enrollment" FROM "division_i" WHERE "affiliation"='Private/ Disciples of Christ';