Consider an economy with two types of firms, S and I. S firms all move together. I firms move independently. For both types of firms there is a 60% probability that the firm will have a 15% return and a 40% probability that the firm will have a - 10% return. What is the volatility (standard deviation) of a portfolio that consists of an equal investment in: a. 20 firms of type S? b. 20 firms of type I? . . . . . a. What is the volatility (standard deviation) of a portfolio that consists of an equal investment in 20 firms of type S? Standard deviation is %. (Round to two decimal places.)The figure in the popup window, , shows the one-year return distribution for RCS stock. Calculate: a. The expected return. b. The standard deviation of the return. Note: Make sure to round all intermediate calculations to at least five decimal places. . . . . . a. The expected return. The expected return is 6.25 %. (Round to two decimal places.) b. The standard deviation of the return. The standard deviation is %. (Round to two decimal places.)Note: Make sure to round all intermediate calculations to at least five d X Graph/chart a. The expected return. The expected return is 6.25 %. (Round to two decimal places.) 35- b. The standard deviation of the return. 30- The standard deviation is %. (Round to two decimal places.) 25 20- Probability % 15 10- B C D E A: -30% return B: -5% return C:0% return D: 5% return E: 30% return Print Done