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2. The annual returns for GlaxoSmithKline and for Aetna are show in the table. What is the average return and standard deviation of returns for

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2. The annual returns for GlaxoSmithKline and for Aetna are show in the table. What is the average return and standard deviation of returns for these two firms? What is the average return and risk of a portfolio consisting of 75 percent of GlaxoSmithKline and 25 percent Aetna

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