Data from the Bureau of Labor Statistics' Consumer Expenditure Survey show that annual expenditures for cellular phone services per consumer unit increased from $233 in 2001 to $600 in 2007. Let the standard deviation of annual cellular expenditure be $45 in 2001 and $128 in 2007. [You may find it useful to reference the z table.) a. What is the probability that the average annual expenditure of 146 cellular customers in 2001 exceeded $2287 (Roundr value to 2 decimal places, and final answer to 4 decimal places.) Probability b. What is the probability that the average annual expenditure of 146 cellular customers in 2007 exceeded $619? (Round value to 2 decimal places, and final answer to 4 decimal places.)

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please a and b
Data from the Bureau of Labor Statistics' Consumer Expenditure Survey show that annual expenditures for cellular phone services per
consumer unit increased from $233 in 2001 to $600 in 2007. Let the standard deviation of annual cellular expenditure be $45 in 2001
and $128 in 2007. (You may find it useful to reference the z table.)
a. What is the probability that the average annual expenditure of 146 cellular customers in 2001 exceeded $2287 (Round " value to
2 decimal places, and final answer to 4 decimal places.)
Probability
b. What is the probability that the average annual expenditure of 146 cellular customers in 2007 exceeded $619? (Round " value to
2 decimal places, and final answer to 4 decimal places.)
Probablity
Transcribed Image Text:Data from the Bureau of Labor Statistics' Consumer Expenditure Survey show that annual expenditures for cellular phone services per consumer unit increased from $233 in 2001 to $600 in 2007. Let the standard deviation of annual cellular expenditure be $45 in 2001 and $128 in 2007. (You may find it useful to reference the z table.) a. What is the probability that the average annual expenditure of 146 cellular customers in 2001 exceeded $2287 (Round " value to 2 decimal places, and final answer to 4 decimal places.) Probability b. What is the probability that the average annual expenditure of 146 cellular customers in 2007 exceeded $619? (Round " value to 2 decimal places, and final answer to 4 decimal places.) Probablity
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