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A random sample of 80 tires showed that the mean mileage per tire was 41,400mi, with a standard deviation of 4700mi

A random sample of 80 tires showed that the mean mileage per tire was 41400mi with a standard deviation of 4700mi class=

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Medunno13

Question 14

Part (a)

[tex]\frac{46800-41400}{4700} \approx \boxed{1.15}[/tex]

Part (b)

[tex]-2.57=\frac{x-41400}{4700} \\ \\ -2.57(4700)=x-41400 \\ \\ x=41400-2.57(4700) \\ \\ x \approx \boxed{29300}[/tex]

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