In: Finance
A stock had returns of 10 percent, -4 percent, 4 percent, and 18 percent over the past four years. What is the standard deviation of these returns?
Answer is standard deviation 9.31%
| Period | return | (return -Mean)^2 |
| 1 | 10% | 0.0009 |
| 2 | -4% | 0.0121 |
| 3 | 4% | 0.0009 |
| 4 | 18% | 0.0121 |
| Total variance | 0.0087 | |
| standard deviation Sqrt of ((Total Varaince)/(4-1)) | 9.31% | |
| Mean | 7.00% |