From df941c91b10d4a77631ecc85c51dc527642684b7 Mon Sep 17 00:00:00 2001
From: akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Thu, 14 Apr 2016 12:56:38 +0000
Subject: [DOC]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54578 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 array.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/array.c b/array.c
index ca20116fdd..d85e32ccae 100644
--- a/array.c
+++ b/array.c
@@ -5667,9 +5667,13 @@ rb_ary_dig(int argc, VALUE *argv, VALUE self)
  *   [].sum(0.0)                        #=> 0.0
  *   [1, 2, 3].sum                      #=> 6
  *   [3, 5.5].sum                       #=> 8.5
- *   [2.5, 3.0].sum(0.0) {|v| v * v }   #=> 15.25
+ *   [2.5, 3.0].sum(0.0) {|e| e * e }   #=> 15.25
  *   [Object.new].sum                   #=> TypeError
  *
+ * The (arithmetic) mean value of an array can be obtained* as follows.
+ *
+ *   mean = ary.sum(0.0) / ary.length
+ *
  * This method may not respect method redefinition of "+" methods
  * such as Fixnum#+.
  *
-- 
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