The reproducibility of a method for determining selenium in foods was investigated by taking nine samples from a single batch of brown rice and determining the selenium concentration in each. The following results were obtained: 0.07, 0.07, 0.08, 0.07, 0.07, 0.08, 0.08, 0.09, 0.08 μg/g Calculate the mean, standard deviation, and relative standard deviation of these results.

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