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A portfolio management organization analyzes 80 stocks and constructs a mean-variance efficient portfolio using only these 80 ecurities. Required: a. How many estimates of expected

image text in transcribed A portfolio management organization analyzes 80 stocks and constructs a mean-variance efficient portfolio using only these 80 ecurities. Required: a. How many estimates of expected returns, variances, and covariances are needed to optimize this portfolio? b. If one could safely assume that stock market returns closely resemble a single-index structure, how many estimates would be needed

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