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From: tmoran@acm.org
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Subject: Re: OT: definition of "significant figures"
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>         The average of 2.1, 33.1, 2.2 -> is 12.5... Not 12.47, 12.46, or
> 12.46666
  The std dev is 16.24 which is > 12.4666, log(avg/sd) = -.115 so by
the log(avg/sd) definition there are fewer than 1 significant digits.
So the average of 2.1, 33.1, 2.2 would be "10", or perhaps even "10**1"