Ex3. Summer Storme is analyzing an investment. The expected one-year return on the invest- ment is 20 percent. The probability distribution of possible returns is approximately normal with a standard deviation of 15 percent. a. What are the chances that the investment will result in a negative return? b. What is the probability that the return will be greater than 10 percent? 20 percent? 30 percent? 40 percent? 50 percent