QUESTION 28 1 points Save Answer The purpose of diversification is to O reduce the volatility of a portfolio's retur O raise the volatility of a portfolio's return. O reduce the average return on a portfolio. O raise the average return on a portfolio QUESTION 29 1 points Save Answer Commercial banks have high ROE and low ROA. O TRUE O FALSE. QUESTION 30 1 points Save Answer Which of the following is a feature of index mutual funds? They have lower fees. They select and hold stocks to match the performance of a stock index. They do not require managers to select stocks and decide when to buy and sell. O All of the above