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Mathematics, 07.11.2019 02:31 rainbowmc6

Data from the bureau of labor statistics’ consumer expenditure survey show that annual expenditures for cellular phone services per consumer unit increased from $237 in 2001 to $634 in 2007. let the standard deviation of annual cellular expenditure be $52 in 2001 and $207 in 2007. a. what is the probability that the average annual expenditure of 125 cellular customers in 2001 exceeded $220? (round answer to 4 decimal places.) b. what is the probability that the average annual expenditure of 125 cellular customers in 2007 exceeded $607? (round answer to 4 decimal places.)

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