Mathematics, 12.07.2019 20:20 ani61
Data from the bureau of labor statisticsâ 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. what is the probability that the average annual expenditure of 125 cellular customers in 2001 exceeded $220?
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