diff --git a/mod/quiz/classes/grade_calculator.php b/mod/quiz/classes/grade_calculator.php
index 6e3f8dd18e5..5e64077bc13 100644
--- a/mod/quiz/classes/grade_calculator.php
+++ b/mod/quiz/classes/grade_calculator.php
@@ -16,6 +16,8 @@
 
 namespace mod_quiz;
 
+use question_engine_data_mapper;
+
 /**
  * This class contains all the logic for computing the grade of a quiz.
  *
@@ -84,4 +86,26 @@ class grade_calculator {
             quiz_set_grade(0, $quiz);
         }
     }
+
+    /**
+     * Update the sumgrades field of attempts at this quiz.
+     */
+    public function recompute_all_attempt_sumgrades(): void {
+        global $DB;
+        $dm = new question_engine_data_mapper();
+        $timenow = time();
+
+        $DB->execute("
+                UPDATE {quiz_attempts}
+                   SET timemodified = :timenow,
+                       sumgrades = (
+                           {$dm->sum_usage_marks_subquery('uniqueid')}
+                       )
+                 WHERE quiz = :quizid AND state = :finishedstate
+            ", [
+                'timenow' => $timenow,
+                'quizid' => $this->quizobj->get_quizid(),
+                'finishedstate' => quiz_attempt::FINISHED
+            ]);
+    }
 }
diff --git a/mod/quiz/classes/local/reports/attempts_report.php b/mod/quiz/classes/local/reports/attempts_report.php
index ce1f1519ca9..f7f62cc4258 100644
--- a/mod/quiz/classes/local/reports/attempts_report.php
+++ b/mod/quiz/classes/local/reports/attempts_report.php
@@ -18,6 +18,7 @@ namespace mod_quiz\local\reports;
 
 use coding_exception;
 use context_module;
+use mod_quiz\quiz_settings;
 use moodle_url;
 use stdClass;
 use table_sql;
@@ -63,6 +64,9 @@ abstract class attempts_report extends report_base {
     /** @var boolean caches the results of {@see should_show_grades()}. */
     protected $showgrades = null;
 
+    /** @var quiz_settings|null quiz settings object. Set in the init method. */
+    protected $quizobj = null;
+
     /**
      *  Initialise various aspects of this report.
      *
@@ -80,8 +84,8 @@ abstract class attempts_report extends report_base {
      */
     public function init($mode, $formclass, $quiz, $cm, $course): array {
         $this->mode = $mode;
-
-        $this->context = context_module::instance($cm->id);
+        $this->quizobj = new quiz_settings($quiz, $cm, $course);
+        $this->context = $this->quizobj->get_context();
 
         [$currentgroup, $studentsjoins, $groupstudentsjoins, $allowedjoins] = $this->get_students_joins(
                 $cm, $course);
diff --git a/mod/quiz/deprecatedlib.php b/mod/quiz/deprecatedlib.php
index 2c0f7cfaf64..afe1363d16a 100644
--- a/mod/quiz/deprecatedlib.php
+++ b/mod/quiz/deprecatedlib.php
@@ -322,3 +322,16 @@ function quiz_update_sumgrades($quiz) {
         'Please use a standard grade_calculator::recompute_quiz_sumgrades instead.', DEBUG_DEVELOPER);
     quiz_settings::create($quiz->id)->get_grade_calculator()->recompute_quiz_sumgrades();
 }
+
+/**
+ * Update the sumgrades field of the attempts at a quiz.
+ *
+ * @param stdClass $quiz a quiz.
+ * @deprecated since Moodle 4.2. Please use grade_calculator::recompute_all_attempt_sumgrades.
+ * @todo MDL-76612 Final deprecation in Moodle 4.6
+ */
+function quiz_update_all_attempt_sumgrades($quiz) {
+    debugging('quiz_update_all_attempt_sumgrades is deprecated. ' .
+        'Please use a standard grade_calculator::recompute_all_attempt_sumgrades instead.', DEBUG_DEVELOPER);
+    quiz_settings::create($quiz->id)->get_grade_calculator()->recompute_all_attempt_sumgrades();
+}
diff --git a/mod/quiz/edit_rest.php b/mod/quiz/edit_rest.php
index e9f7009fd8f..6bb3f775167 100644
--- a/mod/quiz/edit_rest.php
+++ b/mod/quiz/edit_rest.php
@@ -133,7 +133,7 @@ switch($requestmethod) {
                             // Grade has really changed.
                             quiz_delete_previews($quiz);
                             $gradecalculator->recompute_quiz_sumgrades();
-                            quiz_update_all_attempt_sumgrades($quiz);
+                            $gradecalculator->recompute_all_attempt_sumgrades();
                             quiz_update_all_final_grades($quiz);
                             quiz_update_grades($quiz, 0, true);
                         }
diff --git a/mod/quiz/locallib.php b/mod/quiz/locallib.php
index f0ba1f0e56b..9333df6e097 100644
--- a/mod/quiz/locallib.php
+++ b/mod/quiz/locallib.php
@@ -628,27 +628,6 @@ function quiz_has_feedback($quiz) {
     return $cache[$quiz->id];
 }
 
-/**
- * Update the sumgrades field of the attempts at a quiz.
- *
- * @param stdClass $quiz a quiz.
- */
-function quiz_update_all_attempt_sumgrades($quiz) {
-    global $DB;
-    $dm = new question_engine_data_mapper();
-    $timenow = time();
-
-    $sql = "UPDATE {quiz_attempts}
-            SET
-                timemodified = :timenow,
-                sumgrades = (
-                    {$dm->sum_usage_marks_subquery('uniqueid')}
-                )
-            WHERE quiz = :quizid AND state = :finishedstate";
-    $DB->execute($sql, ['timenow' => $timenow, 'quizid' => $quiz->id,
-            'finishedstate' => quiz_attempt::FINISHED]);
-}
-
 /**
  * The quiz grade is the maximum that student's results are marked out of. When it
  * changes, the corresponding data in quiz_grades and quiz_feedback needs to be
diff --git a/mod/quiz/report/overview/report.php b/mod/quiz/report/overview/report.php
index 5febc847778..a380d5ef1ee 100644
--- a/mod/quiz/report/overview/report.php
+++ b/mod/quiz/report/overview/report.php
@@ -25,6 +25,7 @@
 use mod_quiz\local\reports\attempts_report;
 use mod_quiz\question\bank\qbank_helper;
 use mod_quiz\quiz_attempt;
+use mod_quiz\quiz_settings;
 
 defined('MOODLE_INTERNAL') || die();
 
@@ -59,7 +60,7 @@ class quiz_overview_report extends attempts_report {
     protected $newquestionidsforold = null;
 
     public function display($quiz, $cm, $course) {
-        global $DB, $OUTPUT, $PAGE;
+        global $DB, $PAGE;
 
         list($currentgroup, $studentsjoins, $groupstudentsjoins, $allowedjoins) = $this->init(
                 'overview', 'quiz_overview_settings_form', $quiz, $cm, $course);
@@ -687,7 +688,8 @@ class quiz_overview_report extends attempts_report {
      * @param stdClass $quiz the quiz settings.
      */
     protected function update_overall_grades($quiz) {
-        quiz_update_all_attempt_sumgrades($quiz);
+        $gradecalculator = $this->quizobj->get_grade_calculator();
+        $gradecalculator->recompute_all_attempt_sumgrades();
         quiz_update_all_final_grades($quiz);
         quiz_update_grades($quiz);
     }
diff --git a/mod/quiz/upgrade.txt b/mod/quiz/upgrade.txt
index f8248e1d60f..402f3fe8e92 100644
--- a/mod/quiz/upgrade.txt
+++ b/mod/quiz/upgrade.txt
@@ -79,7 +79,8 @@ This files describes API changes in the quiz code.
 
 * Various functions related to calculating grades have moved into a new class mod_quiz\grade_calculator.
   You get that using $quizobj->get_grade_calculator(), then the following old functions have become these new methods.
-  - recompute_quiz_sumgrades -> recompute_quiz_sumgrades
+  - quiz_update_sumgrades -> recompute_quiz_sumgrades
+  - quiz_update_all_attempt_sumgrades -> recompute_all_attempt_sumgrades
 
 * Final deprecation (complete removal) of the following functions which were deprecated long ago:
   - quiz_groups_member_added_handler - deprecated since 2.6
diff --git a/question/engine/datalib.php b/question/engine/datalib.php
index 1464c7a8b9e..2f0208a54c4 100644
--- a/question/engine/datalib.php
+++ b/question/engine/datalib.php
@@ -1173,11 +1173,11 @@ ORDER BY
     }
 
     /**
-     * Return a subquery that computes the sum of the marks for all the questions
-     * in a usage. Which useage to compute the sum for is controlled bu the $qubaid
+     * Return a sub-query that computes the sum of the marks for all the questions
+     * in a usage. Which usage to compute the sum for is controlled by the $qubaid
      * parameter.
      *
-     * See {@link quiz_update_all_attempt_sumgrades()} for an example of the usage of
+     * See {@see \mod_quiz\grade_calculator::recompute_all_attempt_sumgrades()} for an example of the usage of
      * this method.
      *
      * This method may be called publicly.