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Sagot :
1$0.8$0.8
2$0.625$0.625
The mean monthly water bill in Nashville, TN is $30, with a standard deviation of $2.50. The z-score corresponding to Natalie's TN water bill of $32 is
z=x−μσ=32−302.5=0.8
The mean monthly water bill in Philadelphia, PA is $45, with a standard deviation of $3.20. The z-score corresponding to Natalie's PA water bill of $47 is
z=x−μσ=47−453.2=0.625
2$0.625$0.625
The mean monthly water bill in Nashville, TN is $30, with a standard deviation of $2.50. The z-score corresponding to Natalie's TN water bill of $32 is
z=x−μσ=32−302.5=0.8
The mean monthly water bill in Philadelphia, PA is $45, with a standard deviation of $3.20. The z-score corresponding to Natalie's PA water bill of $47 is
z=x−μσ=47−453.2=0.625
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