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OpenStudy (anonymous):
what is the standard deviation for the numbers 18, 15, 26, 20,21
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OpenStudy (anonymous):
work for a calculator to do http://www.wolframalpha.com/input/?i=standard+deviation+18%2C+15%2C+26%2C+20%2C21
OpenStudy (anonymous):
but why is the mean 33?? i got 66?
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