What is the standard deviation of the market portfolio

EBK CONTEMPORARY FINANCIAL MANAGEMENT
14th Edition
ISBN:9781337514835
Author:MOYER
Publisher:MOYER
Chapter8: Analysis Of Risk And Return
Section: Chapter Questions
Problem 6P
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assume that the market consists of two securities. Security A has a market value of $1 billion and a covariance with the market portfolio of 0.15. Security B has a market value of $3 billion and a covariance with the market portfolio of 0.08. What is the standard deviation of the market portfolio?
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