(Answered) A manufacturer claims that the life span of its tires is

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A manufacturer claims that the life span of its tires is 52,000 miles. You work for a consumer protection program and you are testing these tires. Assume the life spans of the tires are normally distributed. You select 100 tires at random and test them. The mean life span is 51,835 miles. Assume the population mean is 800. What is the probability that the mean of the sample is 51,835?

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