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The mean number of text messages sent per month by customers of a cell phone service provider is 1,800, and the standard deviation is

The mean number of text messages sent per month by customers of a cell phone service provider is 1,800, and the standard deviation is 750. Find the z-score associated with each of the numbers of text messages sent. (Round your answer for part (b) to three decimal places.) (a) 0 (b) 11,000 (c) 4,500 (d) 300 N

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