$($Expected rate of return and risk$)$ Summerville Inc. is considering an investment in one of two common stocks. Given the information in the popup window: $,$ which investment is better, based on the risk $($as measured by the standard deviation$)$ and return of each?

a$.$ The expected rate of return for Stock $A$ is $14\%.($Round to two decimal places$)$

The expected rate of return for Stock B is $\%.($Round to two decimal places$)$

b$.$ The standard deviation for Stock $A$ is $\%.($Round to two decimal places$)$

Data table

$($Click on the following icon $$ in order to copy its contents into a spreadsheet.$)$

$\backslash$table$[[$COMMON STOCKA,COMMON STOCK B$],[$PROBABILITY$,$RETURN,PROBABILITY,RETURN$],[0\mathrm{.}30,10\%,0\mathrm{.}10,-6\%$