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Find the standard deviation from the fol...

Find the standard deviation from the following data:

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Let assumed mean `a=3`
Standard deviation `sigma=sqrt((sumf_(i)d_(i)^(2))/(sumf_(i))-((sumf_(i)d_(i))/(sumf_(i)))^(2))`
`=sqrt(124/62-((-30)/62)^(2))=sqrt(2-0.2341)=1.33`
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