Suppose the mean returns on long-term government bonds are 5.8 per cent, and are normally distributed with a standard deviation of 9.3 per cent.

Based on the historical record, what is the approximate probability that your return on these bonds will be less than –3.5 per cent in a given year? What range of returns would you expect to see 95 per cent of the time? What range would you expect to see 99 per cent of the time?