Expected Return and Variances

Consider the following information:

$\backslash$table$[[$State$,$Probability,ABC, Inc. Return$],[$Boom$,\mathrm{.}25,0\mathrm{.}15],[$Normal$,\mathrm{.}50,0\mathrm{.}08],[$Slowdown$,\mathrm{.}15,0\mathrm{.}04],[$Recession$,\mathrm{.}10,-0\mathrm{.}03]]$

What is the expected return? $E(R)={}_i^n{p}_i{R}_i$

What is the variance? ${}^2={\displaystyle \underset{i=1}{\overset{n}{}}}{p}_i(R_i-E(R){)}^2$

What is the standard deviation? $=\sqrt[\phantom{2}]{{}^2}$