[Python-checkins] Update potentially confusing note for mean. (GH-30174) (GH-30221)

[mdickinson]

https://github.com/python/cpython/commit/a2295a4029707ebaf2cd1bb8b3223b73f6dbfee6
commit: a2295a4029707ebaf2cd1bb8b3223b73f6dbfee6
branch: 3.9
author: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
committer: mdickinson <dickinsm at gmail.com>
date: 2021-12-21T12:44:13Z
summary:

Update potentially confusing note for mean. (GH-30174) (GH-30221)

files:
M Doc/library/statistics.rst

diff --git a/Doc/library/statistics.rst b/Doc/library/statistics.rst
index 38a499ab37e89..a6cbdd7695a64 100644
--- a/Doc/library/statistics.rst
+++ b/Doc/library/statistics.rst
@@ -105,10 +105,11 @@ However, for reading convenience, most of the examples show sorted sequences.
 
    .. note::
 
-      The mean is strongly affected by outliers and is not a robust estimator
-      for central location: the mean is not necessarily a typical example of
-      the data points.  For more robust measures of central location, see
-      :func:`median` and :func:`mode`.
+      The mean is strongly affected by `outliers
+      <https://en.wikipedia.org/wiki/Outlier>`_ and is not necessarily a
+      typical example of the data points. For a more robust, although less
+      efficient, measure of `central tendency
+      <https://en.wikipedia.org/wiki/Central_tendency>`_, see :func:`median`.
 
       The sample mean gives an unbiased estimate of the true population mean,
       so that when taken on average over all the possible samples,