diff --git a/en/appendices/3-5-migration-guide.rst b/en/appendices/3-5-migration-guide.rst
index 0635f8bd01..f27bca12e1 100644
--- a/en/appendices/3-5-migration-guide.rst
+++ b/en/appendices/3-5-migration-guide.rst
@@ -175,6 +175,12 @@ cache configuration to fall back to if the engine is misconfigured (or
 unavailable). See :ref:`cache-configuration-fallback` for more information on
 configuring fallbacks.
 
+Collection
+----------
+
+* ``Cake\Collection\Collection::avg()`` was added.
+* ``Cake\Collection\Collection::median()`` was added.
+
 Core
 ----
 
diff --git a/en/core-libraries/collections.rst b/en/core-libraries/collections.rst
index e8cd107d00..7ea383bc95 100644
--- a/en/core-libraries/collections.rst
+++ b/en/core-libraries/collections.rst
@@ -53,27 +53,27 @@ List of Methods
 .. table::
     :class: docutils internal-toc
 
-    +-----------------------+---------------------------+----------------------+---------------------+
-    | :php:meth:`append`    | :php:meth:`buffered`      | :php:meth:`combine`  | :php:meth:`compile` |
-    +-----------------------+---------------------------+----------------------+---------------------+
-    | :php:meth:`contains`  | :php:meth:`countBy`       | :php:meth:`chunk`    | :php:meth:`each`    |
-    +-----------------------+---------------------------+----------------------+---------------------+
-    | :php:meth:`every`     | :php:meth:`extract`       | :php:meth:`filter`   | :php:meth:`first`   |
-    +-----------------------+---------------------------+----------------------+---------------------+
-    | :php:meth:`groupBy`   | :php:meth:`indexBy`       | :php:meth:`insert`   | :php:meth:`isEmpty` |
-    +-----------------------+---------------------------+----------------------+---------------------+
-    | :php:meth:`last`      | :php:meth:`listNested`    | :php:meth:`map`      | :php:meth:`match`   |
-    +-----------------------+---------------------------+----------------------+---------------------+
-    | :php:meth:`max`       | :php:meth:`min`           | :php:meth:`nest`     | :php:meth:`reduce`  |
-    +-----------------------+---------------------------+----------------------+---------------------+
-    | :php:meth:`reject`    | :php:meth:`sample`        | :php:meth:`shuffle`  | :php:meth:`skip`    |
-    +-----------------------+---------------------------+----------------------+---------------------+
-    | :php:meth:`some`      | :php:meth:`sortBy`        | :php:meth:`stopWhen` | :php:meth:`sumOf`   |
-    +-----------------------+---------------------------+----------------------+---------------------+
-    | :php:meth:`take`      | :php:meth:`through`       | :php:meth:`unfold`   | :php:meth:`zip`     |
-    +-----------------------+---------------------------+----------------------+---------------------+
-    | :php:meth:`transpose` | :php:meth:`chunkWithKeys` |                      |                     |
-    +-----------------------+---------------------------+----------------------+---------------------+
+    +---------------------------------------------------+----------------------+------------------------+
+    | :php:meth:`append`        | :php:meth:`avg`       | :php:meth:`buffered` | :php:meth:`combine`    |
+    +---------------------------+-----------------------+----------------------+------------------------+
+    | :php:meth:`compile`       | :php:meth:`contains`  | :php:meth:`countBy`  | :php:meth:`chunk`      |
+    +---------------------------+-----------------------+----------------------+------------------------+
+    | :php:meth:`chunkWithKeys` | :php:meth:`each`      | :php:meth:`every`    | :php:meth:`extract`    |
+    +---------------------------+-----------------------+----------------------+------------------------+
+    | :php:meth:`filter`        | :php:meth:`first`     | :php:meth:`groupBy`  | :php:meth:`indexBy`    |
+    +---------------------------+-----------------------+----------------------+------------------------+
+    | :php:meth:`insert`        | :php:meth:`isEmpty`   | :php:meth:`last`     | :php:meth:`listNested` |
+    +---------------------------+-----------------------+----------------------+------------------------+
+    | :php:meth:`map`           | :php:meth:`match`     | :php:meth:`max`      | :php:meth:`median`     |
+    +---------------------------+-----------------------+----------------------+------------------------+
+    | :php:meth:`min`           | :php:meth:`nest`      | :php:meth:`reduce`   | :php:meth:`reject`     |
+    +---------------------------+-----------------------+----------------------+------------------------+
+    | :php:meth:`sample`        | :php:meth:`shuffle`   | :php:meth:`skip`     | :php:meth:`some`       |
+    +---------------------------+-----------------------+----------------------+------------------------+
+    | :php:meth:`sortBy`        | :php:meth:`stopWhen`  | :php:meth:`sumOf`    | :php:meth:`take`       |
+    +---------------------------+-----------------------+----------------------+------------------------+
+    | :php:meth:`through`       | :php:meth:`transpose` | :php:meth:`unfold`   | :php:meth:`zip`        |
+    +---------------------------+-----------------------+----------------------+------------------------+
 
 Iterating
 =========
@@ -470,6 +470,40 @@ elements::
 
     $sumOfDadAges = $collection->sumOf('dad.age');
 
+.. php:method:: avg($matcher = null)
+
+Calculate the average value of the elements in the collection. Optionally
+provide a matcher path, or function to extract values to generate the average
+for::
+
+    $items = [
+       ['invoice' => ['total' => 100]],
+       ['invoice' => ['total' => 200]],
+    ];
+
+    // Average: 150
+    $average = (new Collection($items))->avg('invoice.total');
+
+.. versionadded:: 3.5.0
+
+.. php:method:: median($matcher = null)
+
+Calculate the median value of a set of elements. Optionally provide a matcher
+path, or function to extract values to generate the median for::
+
+    $items = [
+      ['invoice' => ['total' => 400]],
+      ['invoice' => ['total' => 500]],
+      ['invoice' => ['total' => 100]],
+      ['invoice' => ['total' => 333]],
+      ['invoice' => ['total' => 200]],
+    ];
+
+    // Median: 333
+    $median = (new Collection($items))->median('invoice.total');
+
+.. versionadded:: 3.5.0
+
 Grouping and Counting
 ---------------------