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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
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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 41,400mi, with-example-1
User Suresh Karia
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Question 14

Part (a)


(46800-41400)/(4700) \approx \boxed{1.15}

Part (b)


-2.57=(x-41400)/(4700) \\ \\ -2.57(4700)=x-41400 \\ \\ x=41400-2.57(4700) \\ \\ x \approx \boxed{29300}

User Anna Harrison
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