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February 27, 2015

February 27, 2015

Posted by **Sharon** on Monday, July 25, 2011 at 7:12am.

- statistics -
**PsyDAG**, Monday, July 25, 2011 at 11:48am69 = Σx/30

70 = Σx/31

Solve each for Σx, then subtract one from the other.

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