Assume that security returns are generated by the single-index model,Ri = αi βiRM eiwhere Ri is the excess return for security i and RM is the market's excess return. The risk-free rate is 3%. Suppose also that there are three securities A, B, and C, characterized by the following data:Security βi E(Ri) σ(ei) A 1.4 14% 23% B 1.6 16% 14% C 1.8 18% 17% a. If σM = 22%, calculate the variance of returns of securities A, B, and C.b. Now assume that there are an infinite number of assets with

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