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z=1.96;p=420/830;n=830; N[(p+z^2/(2 n)-z*Sqrt[(p(1-p)+z^2/(4 n))/n])/(1+z^2/n)]
z=1.96;p=420/830;n=830; N[(p+z^2/(2 n)-z*Sqrt[(p(1-p)+z^2/(4 n))/n])/(1+z^2/n)]
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