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This method will use weighted average approach. Weighted average for an investment= sum of (probability*return)
For example, for money market fund, weighted average = 0.1*1.7 + 0.2*2.8 + 0.4*3 + 0.2*3.6 + 0.1*4.5 = 3.10
"Risk fund" is the best investment as it has the highest expected value of 7.81%.
expected value = weighted average, using the probabilities as weights.