You are considering two assets with the following characteristics.

$E(R_1)=0\mathrm{.}13,E({}_1)=0\mathrm{.}11,w_1=0\mathrm{.}3$

$E(R_2)=0\mathrm{.}21,E({}_2)=0\mathrm{.}17,w_2=0\mathrm{.}7$

to five decimal places.

What is rhe mean of two portfolios:

What is the standard deviation of two portfolios if $r_{1,2}=0\mathrm{.}45$ :

What is standard deviation of two portfolios if $r_{1,2}=-0\mathrm{.}50$