Acrylamide is a potential carcinogen that forms in certain foods, such as potato chips and French fries. The FDA analyzed McDonald’s French fries purchased at seven different locations; the following are the resulting acrylamide levels (in micrograms per kg of food):

Calculate ∑x_i and ∑ x²_i and then s² and s.

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497 193 328 155 326 245 270