Position Bins

CASE
    WHEN FLOOR(Average Position) <= 3 THEN "1. Top 3"
    WHEN FLOOR(Average Position) <= 10 THEN "2. Pos 4-10"
    WHEN FLOOR(Average Position) <= 20 THEN "3. Pos 11-20"
    WHEN FLOOR(Average Position) <= 50 THEN "4. Pos 21-50"
    ELSE "5. Above 50"
END