Given the following information:

Expected return on Stock A $\mathrm{.}09,$ Standard deviation of return $\mathrm{.}1$

Expected return on Stock B $\mathrm{.}18,$ Standard deviation of return $\mathrm{.}16$

Correlation coefficient of the returns on Stock A and Stock B $\mathrm{.}4.$

a$.$ What are the expected returns and standard deviations of the following portfolios: $70$ percent of funds invested in stock A and the rest in stock B$?$

b$.$ Suppose the correlation coefficient was $-\mathrm{.}3$ then, what are the expected returns and standard deviations of the following portfolios: $60$ percent of funds invested in stock A and the rest in stock B$?$

As an investor which situation you prefer a or b and why?