a$.$ Calculate the expected mean return for share A and for share $B$

b$.$ Calculate the standard deviation of return for share A$.($Standard deviation of return for

share $B$ is $93\mathrm{.}14)$

c$.$ Which share would you invest in$,$ share A or share B$?$ Explain.

d$.$ If you want to create a portfolio with $30\%$ investment in share A and $70\%$ investment in

share $B,$ what is the expected portfolio mean return?