An investor puts 10 000 into each of four stocks labeled
An investor puts $10,000 into each of four stocks, labeled A, B, C, and D. The file S04_48.xlsx contains the means and standard deviations of the annual returns of these four stocks. Assuming that the returns of these four stocks are independent, find the mean and standard deviation of the total amount that this investor earns in one year from these four investments.

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