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Find the standard deviation by using 20 ...

Find the standard deviation by using 20 as assumed mean.

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Here `a=20`
Standard deviation `sigma=sqrt((sumf_(i)d_(i)^(2))/(sumf_(i))-((sumf_(i)d_(i))/(sumf_(i)))^(2))`
`=sqrt(6525/37-(265/37)^(2))`
`=sqrt(176.35-51.30)`
`=sqrt(125.05)=11.18`
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