CREATE TABLE table_66610 ("School" TEXT, "Location" TEXT, "Mascot" TEXT, "Enrollment" FLOAT, "IHSAA Class" TEXT, "County" TEXT)

Which IHSAA Class has a Mascot of tigers?
SELECT "IHSAA Class" FROM table_66610 WHERE "Mascot" = 'tigers'
SELECT "IHSAA Class" FROM "table_66610" WHERE "Mascot" = 'tigers'