calculate the expected return of each individual stock.
multiply each individual expected stock return by the assigned weight
sum of the products for the expected return
2: calculate the expected returns for the portfolio in the boom and bust states.
calculate the total portfolio expected return
(0.76 x 16.4%) + (0.24 x 6.2%) = 13.9%
calculate deviation of boom and bust portfolios expected return.
16.4% - 13.9% = 2.5%
6.2% - 13.9% = 7.7%
square the deviation of the boom and bust portfolios
2.5%2 = 0.000625
7.7%2 = 0.005929
multiply each square deviation by its respective probabilitty
sum of products for variance
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