1 files changed, 1 insertions, 1 deletions
diff --git a/app/presenters/conversational_development_index/metric_presenter.rb b/app/presenters/conversational_development_index/metric_presenter.rb
index 220014a955a..bb65ba2646b 100644
--- a/app/presenters/conversational_development_index/metric_presenter.rb
+++ b/app/presenters/conversational_development_index/metric_presenter.rb
@@ -138,7 +138,7 @@ module ConversationalDevelopmentIndex
     end
 
     def average_percentage_score
-      cards.map(&:percentage_score).inject(:+) / cards.size.to_f
+      cards.sum(&:percentage_score) / cards.size.to_f
     end
   end
 end