单选题 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
The standard deviation of earnings per share is closest to:
A. 0.51
B. 0.71
C. 0.84

【正确答案】 C
【答案解析】[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。