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Phytopigments are a marker of the amount of organic matter that settles in sediments. Phytopigment concentrations in deep-sea sediments collected world-wide showed a very strong right-skew. Of these two summary statistics, 0.015 and 0.009 grams per square meter of bottom surface, which one is the mean and which one is the median? Explain your reasoning.


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Given: distribution is right-skewed.

For a right-skewed distribution, the mean is higher than the median, because the mean is influenced by the high extreme values of the right-skewed distribution.

MEAN=x=0.015 gramsMEAN=\overline{x}=0.015\text{ grams}

MEDIAN=0.009 gramsMEDIAN=0.009\text{ grams}

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