diff --git a/app/models/exercise.rb b/app/models/exercise.rb
index 151e5437..efdb00c7 100644
--- a/app/models/exercise.rb
+++ b/app/models/exercise.rb
@@ -69,14 +69,17 @@ class Exercise < ActiveRecord::Base
     "
       SELECT user_id,
              user_type,
-             sum(working_time_new) AS working_time
+             SUM(working_time_new) AS working_time,
+             MAX(score) AS score
       FROM
         (SELECT user_id,
                 user_type,
+                score,
                 CASE WHEN working_time >= '0:05:00' THEN '0' ELSE working_time END AS working_time_new
          FROM
             (SELECT user_id,
                     user_type,
+                    score,
                     id,
                     (created_at - lag(created_at) over (PARTITION BY user_id, exercise_id
                                                         ORDER BY created_at)) AS working_time
diff --git a/lib/tasks/detect_exercise_anomalies.rake b/lib/tasks/detect_exercise_anomalies.rake
index c36f5dbe..e22550b2 100644
--- a/lib/tasks/detect_exercise_anomalies.rake
+++ b/lib/tasks/detect_exercise_anomalies.rake
@@ -147,9 +147,11 @@ namespace :detect_exercise_anomalies do
 
   def performers_by_time(exercise, n)
     working_times = get_user_working_times(exercise).values.map do |item|
-      {user_id: item['user_id'], user_type: item['user_type'], value: time_to_f(item['working_time']), reason: 'time'}
+      {user_id: item['user_id'], user_type: item['user_type'], score: item['score'].to_f,
+       value: time_to_f(item['working_time']), reason: 'time'}
     end
-    working_times.reject! {|item| item[:value].nil? or item[:value] <= MIN_USER_WORKING_TIME}
+    avg_score = exercise.average_score
+    working_times.reject! {|item| item[:value].nil? or item[:value] <= MIN_USER_WORKING_TIME or item[:score] < avg_score}
     working_times.sort_by! {|item| item[:value]}
     return {:best => working_times.first(n), :worst => working_times.last(n)}
   end