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Expected rate of return and standard deviation

Need some assistance on the following problem. Have an exam and this is a sample problem I cannot figure out. Please include all formulas so I can get a better grasp on this topic.
RATE OF RETURN
Scenario Probabiltiy Stocks Bonds

Recession .20 -5% +14%

Normal .60 +15% +8%

Boom .20 +25% +4%

18. Portfolio Analysis. Use the data in the previous
problem and consider a portfolio with weights of .60 in
stocks and .40 in bonds.
a. What is the rate of return on the portfolio in
each scenario?
b. What is the expected rate of return and
standard deviation of the portfolio?
c. Would you prefer to invest in the portfolio, in
stocks only, or in bonds only?

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Need some assistance on the following problem. Have an exam and this is a sample problem I cannot figure out. Please include all formulas so I can get a better grasp on this topic.
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Solution Summary

This explains the computation of expected rate of return and standard deviation of the portfolio

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