Convert statistics sum of squares to a single pass algorithm

BPO	46257
Nosy	@rhettinger, @stevendaprano
PRs	bpo-46257: Convert statistics._ss() to a single pass algorithm #30403

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2022-01-05.15:39:37.204>
created_at = <Date 2022-01-04.17:04:05.171>
labels = ['3.11', 'library', 'performance']
title = 'Convert statistics sum of squares to a single pass algorithm'
updated_at = <Date 2022-01-05.15:39:37.203>
user = 'https://github.com/rhettinger'

bugs.python.org fields:

activity = <Date 2022-01-05.15:39:37.203>
actor = 'rhettinger'
assignee = 'none'
closed = True
closed_date = <Date 2022-01-05.15:39:37.204>
closer = 'rhettinger'
components = ['Library (Lib)']
creation = <Date 2022-01-04.17:04:05.171>
creator = 'rhettinger'
dependencies = []
files = []
hgrepos = []
issue_num = 46257
keywords = ['patch']
message_count = 2.0
messages = ['409692', '409777']
nosy_count = 2.0
nosy_names = ['rhettinger', 'steven.daprano']
pr_nums = ['30403']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'performance'
url = 'https://bugs.python.org/issue46257'
versions = ['Python 3.11']