The Stock Market of Country a Has an Expected Return

Essay

The stock market of country A has an expected return of 5 percent,and a standard deviation of expected return of 8 percent.The stock market of country B has an expected return of 15 percent and a standard deviation of expected return of 10 percent.
Is it reasonable to conclude that your portfolio is on the efficient frontier? If not,then prove your point by finding just one portfolio weighting between A and B that offers more return with less risk.If you think it is on the efficient frontier,why do you think this? Either way,your answer should include verification.