ST Alpha - "Dumb question......in a normal curve, a standard deviation covers about 68% of the records, 2 SD's cover about 95%" (Reading a Post)

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Dumb question......in a normal curve, a standard deviation covers about 68% of the records, 2 SD's cover about 95%

Posted by Will Hunting (aka JoeMetz) Apr 7 '10, 07:44

what is the method to determine how many SD's will cover 80%?

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