A three$-$asset portfolio has the following characteristics

$\backslash$table$[[$Asset$,\backslash$table$[[$Expected$],[$Return$]],\backslash$table$[[$Expected$],[$Standard$],[$Deviation$]],$Weight$],[x,0\mathrm{.}15,0\mathrm{.}22,0\mathrm{.}5],[Y,0\mathrm{.}1,0\mathrm{.}08,0\mathrm{.}4],[Z,0\mathrm{.}06,0\mathrm{.}03,0\mathrm{.}1]]$

Calculate the expected return on this three asset portfolio.

$3.$ An investor is considering adding another investment to a portfolio. To achieve the maximum diversification benefits, the investor should add, if possible, an investment that has which of the following correlation coefficients with the other investments in the portfolio?

a$.-1\mathrm{.}0$

b$.-0\mathrm{.}5$

c$.0\mathrm{.}0$

d$.+1\mathrm{.}0$

Need help for Q$3$ thanks