If you want to invest in a portfolio that consists from two assets, stock X as 70% from this investment and stock Z as 30%. The expected rate of return on share X is 15% and for Z is 9%, the standard deviation of stock X is 16% and stock Z is 7%, the correlation between the two shares is 0.9, find the following: 1- The portfolio expected rate of return. (5 marks) 2- The portfolio standard deviation STD (risk)