please show all steps

7. What are the expected rehum and the standard deviation for the COR Strcle CoR Stoak \begin{tabular}{|l|c|r|} \hline Scenario & Probability & Rate of \\ of Scenario & Retirm \\ \hline Wost Case & 0.10 & 10% \\ Poor Case & 0.20 & 5% \\ Most Tikely & 0.40 & 1%6 \\ Cood Case & 0.20 & 4%6 \\ Best Case & 0.10 & 12%6 \\ \hline \end{tabular}