3. The return of Stock A in the last 4 years is 1%, 2%, 3% and 4%. Calculate the return variance and return standard deviation. (15 points) Show your calculation to get full points. Answer: I 4. The average return of Intermediate-term government bonds is 6% per year and the standard deviation is 2%. What range of returns would you expect to see 95 percent of the time for Intermediate-term government bonds? What about 99.7 percent of the time? (12 points) Show your calculation to get full points