Mathematics, 25.02.2020 22:49, robert7248
Electricity bills: According to a government energy agency, the mean monthly household electricity bill in the United States in 2011 was $109.72. Assume the amounts are normally distributed with standard deviation $24.00. Use the TI-84 Plus calculator to answer the following. (a) What proportion of bills are greater than $131
Answers: 3
and standard deviation 
, the zscore of a measure X is given by:
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Electricity bills: According to a government energy agency, the mean monthly household electricity b...
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