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<math>\sum {x} =120 </math> <br>
 
<math>\sum {x} =120 </math> <br>
σ=<math>\sqrt{ \frac{\sum {x}^{2} }{n}} -\frac{( {\sum {x}{n} ) ^{2}} }</math>
+
σ=<math>\sqrt{\frac{\sum {x^2}}{n}}-{\frac{({\sum{x}{n})^{2}}}</math>

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