refactor: improve score distribution display and enhance HTMX handling in exam views

generic/views.py

@@ -4066,10 +4066,6 @@ class ExamViews(View, LoginRequiredMixin):
             pass_rate = 0.0
 
             if len(user_scores_list) >= 1:
-                lower_score_bound = max_score / 5
-                bounded_scores = [i for i in user_scores_list if i > lower_score_bound]
-                if bounded_scores:
-                    user_scores_list = bounded_scores
 
                 mean = round(statistics.mean(user_scores_list), 2)
                 median = round(statistics.median(user_scores_list), 2)
@@ -4248,12 +4244,14 @@ class ExamViews(View, LoginRequiredMixin):
         exam.save()
 
         from django.urls import reverse
-        from django.http import HttpResponseRedirect
         url = reverse(f"{self.app_name}:exam_scores_all", kwargs={"pk": pk})
-        response = HttpResponseRedirect(url)
         if request.htmx:
-            response["HX-Redirect"] = url
-        return response
+            # Return 200 OK with HX-Redirect header to trigger client-side redirect in HTMX
+            return HttpResponse("", headers={"HX-Redirect": url})
+        
+        # Standard non-HTMX redirect
+        from django.http import HttpResponseRedirect
+        return HttpResponseRedirect(url)
 
     def toggle_candidate_stats_exclusion(self, request, pk):
         exam = get_object_or_404(self.Exam, pk=pk)