please show work per excel

Here are the expected returns on two assets: If you form a 50-50 portfolio of the two stocks, what is their combined estimated rate of return (E(Rxy))? You must first calculate the E(R) of the two individual stocks. Then determine the joint E(R) of the combined portfolio. Slides 8,15,16 and 18 can be your guides for this question and the question requesting the standard deviation of XY. Proof of work required. Carry your standard deviation to one (1) decimal point; .1826 recorded as 18.3