you are making a stock portfolio with 2 stocks available . Stock A's expected return is 10% and has a standard deviation of 15%. Stock B's expected return is 5% and has an standard deviation of 10%. Both stocks have a correlation of 0.7. You decide to invest $2000 in Stock A and $4000 in Stock B, what is the expected return and standard deviation of the portfolio? show that diversification works by using the information given and your calculations