Find the probability that the mean of a random sample

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Reference no: EM1321287

Question1: According to internal testing done by the GG tire company, the mean lifetime of tires sold on new cars is 23,000 miles with a standard deviation of 2500 miles. If the distribution of tire life is approximately normal, what is the probability that the mean of a random sample of size n = 4 of tire lifetimes will be less than 20,000 miles?

Reference no: EM1321287

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