diff --git a/mod/feedback/item/multichoicerated/lib.php b/mod/feedback/item/multichoicerated/lib.php
index 0322833..223f7aa 100644
--- a/mod/feedback/item/multichoicerated/lib.php
+++ b/mod/feedback/item/multichoicerated/lib.php
@@ -66,6 +66,13 @@ class feedback_item_multichoicerated extends feedback_item_base {
         
         $analysedAnswer = array();
 
+        $answers = 0;
+        foreach($values as $value) {
+            if($value->value > 0) {
+                $answers++;
+            }
+        }
+
         for($i = 1; $i <= sizeof($lines); $i++) {
             $item_values = explode(FEEDBACK_MULTICHOICERATED_VALUE_SEP, $lines[$i-1]);
             $ans = null;
@@ -80,7 +87,7 @@ class feedback_item_multichoicerated extends feedback_item_base {
                 }
             }
             $ans->answercount = $anscount;
-            $ans->avg = doubleval($avg) / doubleval(sizeof($values));
+            $ans->avg = doubleval($avg) / doubleval($answers);
             $ans->value = $item_values[0];
             $ans->quotient = $ans->answercount / sizeof($values);
             $analysedAnswer[] = $ans;