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According to internal testing done by the Get-A-Grip 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 Get-A-Grip is true, what is the mean of the sampling distribution of x-bar for samples of size n = 4?

asked by Brianna

  1. X-bar = 23000

    posted by Kuai
  2. ?

    posted by nick

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