Data from the Bureau of Labor Statistics’ Consumer Expenditure Survey show that annual expenditures for cellular...

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Data from the Bureau of Labor Statistics’ Consumer Expenditure Survey show that annual expenditures for cellular...

Data from the Bureau of Labor Statistics’ Consumer Expenditure Survey show that annual expenditures for cellular phone services per consumer unit increased from $229 in 2001 to $599 in 2007. Let the standard deviation of annual cellular expenditure be $63 in 2001 and $120 in 2007.

a. What is the probability that the average annual expenditure of 122 cellular customers in 2001 exceeded $222? (Round answer to 4 decimal places.)

b. What is the probability that the average annual expenditure of 122 cellular customers in 2007 exceeded $592? (Round answer to 4 decimal places.)

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