diff --git a/reportbuilder/classes/local/aggregation/avg.php b/reportbuilder/classes/local/aggregation/avg.php
index 09e79b9ee25..16ff16a9c4b 100644
--- a/reportbuilder/classes/local/aggregation/avg.php
+++ b/reportbuilder/classes/local/aggregation/avg.php
@@ -49,6 +49,7 @@ class avg extends base {
         return in_array($columntype, [
             column::TYPE_INTEGER,
             column::TYPE_FLOAT,
+            column::TYPE_BOOLEAN,
         ]);
     }
 
@@ -72,6 +73,6 @@ class avg extends base {
      * @return mixed
      */
     public static function format_value($value, array $values, array $callbacks) {
-        return sprintf('%.1f', (float) reset($values));
+        return format_float((float) reset($values), 1);
     }
 }
diff --git a/reportbuilder/classes/local/aggregation/percent.php b/reportbuilder/classes/local/aggregation/percent.php
index 62fae8afa59..29b9878196c 100644
--- a/reportbuilder/classes/local/aggregation/percent.php
+++ b/reportbuilder/classes/local/aggregation/percent.php
@@ -72,6 +72,6 @@ class percent extends base {
      * @return mixed
      */
     public static function format_value($value, array $values, array $callbacks) {
-        return format::percent((float) reset($values));
+        return format::percent(reset($values));
     }
 }
diff --git a/reportbuilder/classes/local/helpers/format.php b/reportbuilder/classes/local/helpers/format.php
index 8a0a2971764..0ac617e6e40 100644
--- a/reportbuilder/classes/local/helpers/format.php
+++ b/reportbuilder/classes/local/helpers/format.php
@@ -61,6 +61,6 @@ class format {
      * @return string
      */
     public static function percent($value): string {
-        return sprintf('%.1f%%', (float) $value);
+        return format_float((float) $value, 1) . '%';
     }
 }
diff --git a/reportbuilder/tests/behat/columnaggregationeditor.feature b/reportbuilder/tests/behat/columnaggregationeditor.feature
index 0ceccb9714c..2eaaca32c06 100644
--- a/reportbuilder/tests/behat/columnaggregationeditor.feature
+++ b/reportbuilder/tests/behat/columnaggregationeditor.feature
@@ -92,9 +92,31 @@ Feature: Manage custom report columns aggregation
       | Count distinct                  | 2            |
       | Maximum                         | Yes          |
       | Minimum                         | No           |
+      | Average                         | 0.7          |
       | Percentage                      | 66.7%        |
       | Sum                             | 2            |
 
+  Scenario Outline: Aggregated columns display localised floats
+    Given the following "language customisations" exist:
+      | component       | stringid | value |
+      | core_langconfig | decsep   | ,     |
+    And the following "core_reportbuilder > Reports" exist:
+      | name      | source                                   | default |
+      | My report | core_user\reportbuilder\datasource\users | 0       |
+    And the following "core_reportbuilder > Columns" exist:
+      | report    | uniqueidentifier |
+      | My report | user:lastname    |
+      | My report | user:confirmed   |
+    And I am on the "My report" "reportbuilder > Editor" page logged in as "admin"
+    And I change window size to "large"
+    When I set the "Confirmed" column aggregation to "<aggregation>"
+    Then I should see "Aggregated column 'Confirmed'"
+    And I should see "<output>" in the "Richie" "table_row"
+    Examples:
+      | aggregation | output |
+      | Average     | 0,7    |
+      | Percentage  | 66,7%  |
+
   Scenario: Show unique report rows
     Given the following "core_reportbuilder > Reports" exist:
       | name      | source                                   | default | uniquerows |
diff --git a/reportbuilder/tests/local/aggregation/avg_test.php b/reportbuilder/tests/local/aggregation/avg_test.php
new file mode 100644
index 00000000000..6162b04764a
--- /dev/null
+++ b/reportbuilder/tests/local/aggregation/avg_test.php
@@ -0,0 +1,76 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+declare(strict_types=1);
+
+namespace core_reportbuilder\local\aggregation;
+
+use core_reportbuilder_testcase;
+use core_reportbuilder_generator;
+use core_user\reportbuilder\datasource\users;
+
+defined('MOODLE_INTERNAL') || die();
+
+global $CFG;
+require_once("{$CFG->dirroot}/reportbuilder/tests/helpers.php");
+
+/**
+ * Unit tests for avg aggregation
+ *
+ * @package     core_reportbuilder
+ * @covers      \core_reportbuilder\local\aggregation\avg
+ * @copyright   2022 Paul Holden <paulh@moodle.com>
+ * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class avg_test extends core_reportbuilder_testcase {
+
+    /**
+     * Test aggregation when applied to column
+     */
+    public function test_column_aggregation(): void {
+        $this->resetAfterTest();
+
+        // Test subjects.
+        $this->getDataGenerator()->create_user(['firstname' => 'Bob', 'suspended' => 1]);
+        $this->getDataGenerator()->create_user(['firstname' => 'Bob', 'suspended' => 0]);
+
+        /** @var core_reportbuilder_generator $generator */
+        $generator = $this->getDataGenerator()->get_plugin_generator('core_reportbuilder');
+        $report = $generator->create_report(['name' => 'Users', 'source' => users::class, 'default' => 0]);
+
+        // First column, sorted.
+        $generator->create_column(['reportid' => $report->get('id'), 'uniqueidentifier' => 'user:firstname'])
+            ->set('sortenabled', true)
+            ->update();
+
+        // This is the column we'll aggregate.
+        $generator->create_column(['reportid' => $report->get('id'), 'uniqueidentifier' => 'user:suspended'])
+            ->set('aggregation', avg::get_class_name())
+            ->update();
+
+        $content = $this->get_custom_report_content($report->get('id'));
+        $this->assertEquals([
+            [
+                'c0_firstname' => 'Admin',
+                'c1_suspended' => '0.0',
+            ],
+            [
+                'c0_firstname' => 'Bob',
+                'c1_suspended' => '0.5',
+            ],
+        ], $content);
+    }
+}
diff --git a/reportbuilder/tests/local/aggregation/sum_test.php b/reportbuilder/tests/local/aggregation/sum_test.php
index 8d5fb393c23..d458636a600 100644
--- a/reportbuilder/tests/local/aggregation/sum_test.php
+++ b/reportbuilder/tests/local/aggregation/sum_test.php
@@ -28,7 +28,7 @@ global $CFG;
 require_once("{$CFG->dirroot}/reportbuilder/tests/helpers.php");
 
 /**
- * Unit tests for percent aggregation
+ * Unit tests for sum aggregation
  *
  * @package     core_reportbuilder
  * @covers      \core_reportbuilder\local\aggregation\base
diff --git a/reportbuilder/tests/local/helpers/format_test.php b/reportbuilder/tests/local/helpers/format_test.php
index ef365d08ffb..e354b2f5531 100644
--- a/reportbuilder/tests/local/helpers/format_test.php
+++ b/reportbuilder/tests/local/helpers/format_test.php
@@ -64,4 +64,11 @@ class format_test extends advanced_testcase {
     public function test_boolean_as_text(bool $value, string $expected): void {
         $this->assertEquals($expected, format::boolean_as_text($value));
     }
+
+    /**
+     * Test percentage formatting of a float
+     */
+    public function test_percent(): void {
+        $this->assertEquals('33.3%', format::percent(1 / 3 * 100));
+    }
 }