Which of the following statements are true with respect to standard deviation as a measure of risk?
1) The standard deviation of a portfolio of two imperfectly correlated stocks could be lower than either of the two stocks individually
2) Standard deviation is relatively easy to compute
3) Standard deviation may suggest that deviation above and below the mean results are equally bad when in fact one might be worse
4) Standard deviation is susceptible to the stationarity assumption
5) Standard deviation is often quoted as a percent