单选题
An analyst is investigating a stock index and gathered the following information:
A、
Mean total revenue for all companies in the index
B、
$1.8 million
C、
Standard deviation of total revenue for all companies in the index
D、
$ 2.4 million
【正确答案】
C
【答案解析】
σ
X
=σ/N
1/2
=240000/56
1/2
=320713
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