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Assuming the manufacturers claim is correct what is the

A manufacturer claims that the life span of its tires is 48,000 miles. You work for a consumer protection agency 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 47,860 miles. Assume σ=800.

(a) Assuming the manufacturer's claim is correct, what is the probability that the mean of the sample is 47,860 miles or less?

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