continue refactoring

app/models/score.rb

@@ -2,4 +2,9 @@
 
 class Score < Struct.new(:average, :meets_teacher_threshold?, :meets_student_threshold?, :meets_admin_data_threshold?)
   NIL_SCORE = Score.new(nil, false, false, false)
+  def in_zone?(zone:)
+    return false if average.nil? || average.is_a?(Float) && average.nan?
+
+    average.between?(zone.low_benchmark, zone.high_benchmark)
+  end
 end

app/presenters/analyze_bar_presenter.rb

@@ -16,11 +16,12 @@ class AnalyzeBarPresenter
   end
 
   def y_offset
+    benchmark_height = analyze_zone_height * 2
     case zone.type
     when :ideal, :approval
-      (analyze_zone_height * 2) - bar_height_percentage
+      benchmark_height - bar_height_percentage
     else
-      (analyze_zone_height * 2)
+      benchmark_height
     end
   end
 
@@ -49,8 +50,7 @@ class AnalyzeBarPresenter
   end
 
   def average
-    average = score.average
+    average = score.average || 0
-    return 0 if average.nil?
 
     average.round(6)
   end

app/presenters/variance_chart_row_presenter.rb

@@ -100,7 +100,8 @@ class VarianceChartRowPresenter
   end
 
   def percentage
-    (@score - zone.low_benchmark) / (zone.high_benchmark - zone.low_benchmark)
+    low_benchmark = zone.low_benchmark
+    (@score - low_benchmark) / (zone.high_benchmark - low_benchmark)
   end
 
   def zone

app/presenters/zones.rb

@@ -9,13 +9,7 @@ class Zones
     @warning_low_benchmark = 1
   end
 
-  Zone = Struct.new(:low_benchmark, :high_benchmark, :type) do
+  Zone = Struct.new(:low_benchmark, :high_benchmark, :type)
-    def contains?(number)
-      return false if number.nil? || number.is_a?(Float) && number.nan?
-
-      number.between?(low_benchmark, high_benchmark)
-    end
-  end
 
   def all_zones
     [
@@ -48,6 +42,6 @@ class Zones
   end
 
   def zone_for_score(score)
-    all_zones.find { |zone| zone.contains?(score) } || insufficient_data
+    all_zones.find { |zone| Score.new(score).in_zone?(zone:) } || insufficient_data
   end
 end