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According to internal testing done by the GetAGrip tire company, the lifetime of tires sold on new cars is normally distributed with a mean of 23,000 miles, with a standard deviation of 2500 miles. If the claim by GetAGrip is true, what is the mean of the sampling distribution of xbar for samples of size n = 4?
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Please help I was up till 2am trying to figure this out last night, Thanks The top selling Red and Voss is rated 70,000 miles, which means nothing. In fact, the distance the tires can run until they wear out is a normally