Diversification and Market History Based on market history what is the average a

Diversification and Market History Based on market history what is the average annual standard deviation of return for a single randomly chosen stock? What is the average annual standard deviation for an equally weighted portfolio of many stocks?Interpreting Correlations If the returns on two stocks are highly correlated what does this mean? If they have no correlation? If they are negatively correlated?Efficient Portfolios What is an efficient portfolio?Expected Returns True or false: If two stocks have the same expected return of 12 percent then any portfolio of the two stocks will also have an expected return of 12 percent.