From: Raymond Hettinger <rhettinger@users.noreply.github.com>
Date: Tue, 3 May 2022 08:41:46 +0000 (-0500)
Subject: The stdev calculation is more accurate computing its own mean (#92220)
X-Git-Tag: v3.11.0b1~102
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=ec8d3adb99f1ad93786fed5c1def5119b6ec73c0;p=thirdparty%2FPython%2Fcpython.git

The stdev calculation is more accurate computing its own mean (#92220)
---

diff --git a/Lib/statistics.py b/Lib/statistics.py
index f3bc9a1f3463..6e6d62c4a0e2 100644
--- a/Lib/statistics.py
+++ b/Lib/statistics.py
@@ -1173,8 +1173,7 @@ class NormalDist:
         "Make a normal distribution instance from sample data."
         if not isinstance(data, (list, tuple)):
             data = list(data)
-        xbar = fmean(data)
-        return cls(xbar, stdev(data, xbar))
+        return cls(mean(data), stdev(data))
 
     def samples(self, n, *, seed=None):
         "Generate *n* samples for a given mean and standard deviation."