Assume that security returns are generated by the single$-$index model,

${}_1=a_i{t}_1{t}_N{}_i$

where $R_i$ is the excess retum for security iand $A_y$ is the markets excess return. The risk$-$free rate is $2\%.$ Suppose also that there ace three securities A$,$ B$,$ and C$,$ charnctienised by the following data:

$\backslash$table$[[$Security$,B_i,E({}_1),e(lo{n}_1)$