$4\mathrm{.}1.$ Maputo Development Bank has a portfolio of two projects worth R$10$ million. One project has an investment of R$6$million, expected return of $9\%$ and a standard deviation of $15\%.$ The other project has an

investment of R$4$million has an expected return of $4\%$ and a standard deviation of $11\%.$ It is determined that the covariance between the two projects is $4\%.$ Determine the expected return and standard deviation

of the portfolio.

$(10$marks$)$