Assume 2 securities, a, b, constitute market portfolio, having expected returns ( E(ra) =0.10, and E(rb) = 0.15, and stda= 0.2, stdb= 0.28, with proportions 0.4 and 0.6, correlation between 2 securities is 0.3, and the rf=0.05

i) specify CML

ii) interpret beta coefficient