问题
单项选择题
An analyst does research about standard deviation and forecasts the following information about earnings per share (EPS):
| Scenario | Probability of Scenario | Earnings per share |
| 1 | 0.25 | $8.10 |
| 2 | 0.75 | $6.15 |
A. 0.51
B. 0.71
C. 0.84
答案
参考答案：C
解析： 均值(mean)=0.25×$8.10+0.75×$6.15=$6.6375。
标准差(standard deviation)=[0.25×($8.10-$6.6375)2+0.75×($6.15-$6.6375)2]1/2=(0.53473+0.17824)1/2=0.84。