What is the standard deviation of a portfolio of two risky assets if the expected return E(Ri), standard deviation (si), covariance (Covi,j), and asset weight (Wi) are as shown below? \begin{tabular}{l} \hline 25.9% \\ \hline 27.6% \\ \hline 28.0% \\ \hline 22.0% \\ \hline 21.9% \end{tabular} 
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