Assume the information below regarding a three stock portfolio. Calculate the standard deviation of returns for the portfolio.
Stock xi ri σi
1 .5 7% 10%
2 .3 8% 11%
3 .2 11% 14%
ρ12 = .4
ρ13 = .7
ρ23 = .8
a. 21.27%
b. 8.22%
c. 9.13%
d. 9.56%
e. 11.19%
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