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OpenStudy (anonymous):

company produces 2500 items how many will fall in the +1/-1 standard deviation

OpenStudy (dumbcow):

about 68% fall within 1 std dev

OpenStudy (anonymous):

Assuming we're measuring the items in some way which produces a normal distribution, 68% will fall within 1 standard deviation. StatTrek explains further. http://stattrek.com/probability-distributions/normal.aspx?Tutorial=Stat

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