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# Assume that you are considering investing in one of two shares for the next year: BHP Billiton or Rio Tinto.

**(1) Calculate the expected returns for BHP Billiton and Rio Tinto**

**(2) Calculate the standard deviations of the returns for BHP Billiton and Rio Tinto **

**(3) Calculate the coefficients of variation for both shares. (4)Which share do you prefer? And Why?
(5)What's the meaning of a coefficient of variation? **