What is the standard deviation of the return


Problem:

A portfolio is invested 40% in stock R, 35% in Stock S, and 25% in Stock T.

 State of     Probability of Rate of Return if state occurs
Economy State of Economy Stock R Stock S Stock T
Boom 0.25 0.3 0.4 0.25
Good 0.4 0.1 0.15 0.1
Poor 0.25 0 -0.05 -0.1
Bust 0.1 -0.25 -0.15 -0.2

What is the expected return of the portfolio? What is the standard deviation of the return?

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Accounting Basics: What is the standard deviation of the return
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