Question: Which statements about expected return and standard deviation are correct? Multiple select question. The expected return and standard deviation completely describe the distribution of returns

Which statements about expected return and standard deviation are correct?
Multiple select question.
The expected return and standard deviation completely describe the distribution of returns when it is normal.
The standard deviation is the probability-weighted sum of squared deviations from the expected return.
The standard deviation is the square root of the variance.
The expected return and standard deviation are measures of risk.

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