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Expected return and standard deviation

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Please explain how to calculate the expected return and standard deviation of returns when your only given possible outcomes and probability returns.

Possible Outcomes Probability Returns (%)
Pessimistic 0.25 5
Most likely 0.55 10
Optimistic 0.20 13

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The solution explains how to calculate expected return and standard deviation

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The expected return is calculated as the sum of (probability X returns) for each state
The expected ...

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