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# Historical Data on the Risk Characteristic of Dell and McDonalds

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Here are some historical data on the risk characteristic of Dell and McDonalds.
Dell McDonalds
Beta 1.41 .77
Yearly standard deviation of return 30.9 17.2
Assume the standard deviation of the return on the market was 15%.
a. The correlation coefficient of Dell's return versus McDonaldâ??s is .31. What is the standard deviation of a portfolio invested half in Dell and half in McDonalds?

b. What is the standard deviation of a portfolio invested one-third in Dell, one-third in McDonalds, and one-third in risk-free Treasury bills?

c. What is the standard deviation of a portfolio is split evenly between Dell and McDonalds and is financed at 50% margin, i.e., the investor puts up only 50% of the total amount and borrows the balance from the broker?

d. What is the approximate standard deviation of a portfolio composed of 100 stocks with betas of 1.41 like Dell? How about 100 stocks like McDonalds?

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The solution provides the answer to the historical data on the risk characteristic of Dell and McDonalds.

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Frank Fields Jr.
Week 3 Writing Assignment
American Military University
Finc 600

Here are some historical data on the risk characteristic of Dell and McDonald's.
Dell McDonald's
Beta 1.41 .77
Yearly standard deviation of return 30.9 (=0.309) 17.2 (=0.172)
Assume the standard deviation of the return on the market was 15%.
a. The correlation coefficient of Dell's return versus McDonald's is .31. What is the standard deviation of a portfolio invested half in Dell and half in McDonald's?

The formula of the standard deviation of a portfolio is:

(1) Sp = √[∑Wi2Si2 + ∑∑(Wi Si * Wj Sj * Rij)]

where S stands for standard deviation; subscripts i ...

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