Derive the standard deviation of the returns on a portfolio that is invested in stocks x, y, and z , where twenty percent of the portfolio is invested in stock x and 35 percent is invested in Stock z.
State of Economy |
Probability of State of Economy |
Rate of Return if State Occurs |
||||||||||
Stock x |
Stock y |
Stock z |
||||||||||
Boom |
.04 |
.17 |
.09 |
.09 |
||||||||
Normal |
.81 |
.08 |
.06 |
.08 |
||||||||
Recession |
.15 |
− |
.24 |
.02 |
− |
.13 |
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