题目内容

假设股票市场未来有三种状态：熊市、正常、牛市；对应的概率是0．2、0．5、0．3；对应三种状态，股票x的收益率分别是-20％、18％、50％；股票Y的收益率分别是-15％、20％、10％。股票x和股票Y的标准差分别是()。

A. 15％和26％
B. 20％和4％
C. 24％和13％
D. 28％和8％

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假设股票市场未来有三种状态：熊市、正常、牛市；对应的概率是0．2、0．5、0．3；对应三种状态，股票x的收益率分别是-20％、18％、50％；股票Y的收益率分别是-15％、20％、10％。股票x和股票Y的标准差分别是()。

A. 15％和26％ B. 20％和4％ C. 24％和13％ D. 28％和8％

At the party the ______ shy Chelsea felt comfortable enough to offer to give the guests a

Historical research is essential for making inventions.

M: No, I'm not. I'm afraid of breaking my neck. So I'd rather be a bus commuter.Q: Why won't the man learn to drive？(15)

堆是一个键值序列(k1，k2，k…，k1…，k0)，对i=1，2…，[n/2]，满足()

A. 15％和26％
B. 20％和4％
C. 24％和13％
D. 28％和8％

M: No, I'm not. I'm afraid of breaking my neck. So I'd rather be a bus commuter.
Q: Why won't the man learn to drive？
(15)