input: Write a python function to categorize movie ratings.
  assert movie_rating_categorizer([9, 7, 5, 3]) == ["Excellent", "Good", "Average", "Poor"]
  assert movie_rating_categorizer([10, 6, 8, 2]) == ["Excellent", "Average", "Excellent", "Poor"]
  assert movie_rating_categorizer([4, 4.5, 6.5, 7.5]) == ["Poor", "Average", "Good", "Good"]
output: def movie_rating_categorizer(ratings):
      categories = []
      for rating in ratings:
          if rating >= 9:
              categories.append("Excellent")
          elif rating >= 7:
              categories.append("Good")
          elif rating >= 5:
              categories.append("Average")
          else:
              categories.append("Poor")
      return categories