$10.$ Returns and Standard Deviations Consider the following information: State of Economy Probability of State of Economy Rate of Return if State Occurs Stock A Stock B Stock C Boom $\mathrm{.}15\mathrm{.}33\mathrm{.}45\mathrm{.}33$ Good $\mathrm{.}55\mathrm{.}11\mathrm{.}10\mathrm{.}17$ Poor $\mathrm{.}20\mathrm{.}02\mathrm{.}02\mathrm{.}05$ Bust $\mathrm{.}10\mathrm{.}12\mathrm{.}25\mathrm{.}09$