The average cost of a smartphone in North America is $518 with a standard deviation of $13. Consider a random sample of 575 smartphones. According to Chebychev's Theorem, at least how many smartphones in the sample have a cost between $453 and $583?

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Q: 13. 15-16) Which of the following expressions is equal to (2 Points) (4y + 1)(16y2 – 4y + 1)? -

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