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The probability distribution function of a random variable $X$ is shown in the following figure.

From this distribution, random samples with sample size $n=68$ are taken. If $\overline{X}$ is the sample mean, the standard deviation of the probability distribution of $\overline{X}$, i.e. $\sigma_{\overline{X}}$ is _______ (round off to $3$ decimal places)

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