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甲、只股票的相关资料如下: 股票 甲 乙 预期收益率 8% 10% 标准差 2% 3% 证券市场组合的收益率为12%,证券市场组合的标准差为0.6%,无风险收益率为5%。 要求: (1)计算甲、只股票收益率的标准离差率。 (2)假定资本资产定价模型成立,计算甲、只股票β值。 (3)投资者将全部资金按照30%和70%的比例投资购买甲、乙股票构成投资组合,计算该组合的β系数、组合的风险收益率和组合的必要收益率。、
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