$1.$ Find the expected return and standard deviation of each stock:

Probability Return of Stock C Return of Stock D

$0\mathrm{.}3010\%25\%$

$0\mathrm{.}5015\%10\%$

$0\mathrm{.}2040\%0\%$

$2.$ Calculate the expected return and standard deivation of a portfolio made up of $50\%$ stock C and $50\%$ stock D if the correclation is $-0\mathrm{.}75.$

$3.$ Would you prefer to put your money in stock C$,$ stock D or the $50/50$ portfolio? Explain.