Because the statistic called the standard deviation measures the volatility of a variable, it is used to measure the return of a portfolio.

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Standard deviation measures the dispersion or variability of a set of values, not the return of a portfolio. It is used to assess the risk associated with a portfolio's returns by measuring how much the returns deviate from the average return, but it does not measure the return itself.

Because the Statistic Called the Standard Deviation Measures the Volatility