Calculate the covariance between $x$ and $Y.$

a$.+13\mathrm{.}33\%{?}^2$

b$.-24\mathrm{.}28\%{?}^2$

c$.-36\mathrm{.}22\%{?}^2$

d$.-40\mathrm{.}15\%{?}^2$

e$.-48\mathrm{.}44\%{?}^2$

Calculate the correlation coefficient between $x$ and $Y.$

a$.-0\mathrm{.}22$

b$.-0\mathrm{.}35$

c$.-0\mathrm{.}45$

d$.+0\mathrm{.}42$

e$.+0\mathrm{.}50$

Suppose you invest in a portfolio comprising $25\%$ in $x$ and $75\%$ in $Y,$ what is the standard

deviation of returns of the portfolio?

a$.4\mathrm{.}27\%$

b$.5\mathrm{.}21\%$

c$.5\mathrm{.}52\%$

d$.6\mathrm{.}32\%$

e$.6\mathrm{.}48\%$