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O A mechanic sells a brand of automobile tire that has a life expectancy that is normally distributed, with a mean life of 31
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Answer #1

μ = 31000, σ = 2700, x = ?

P(x) = 0.1

Using Excel function NORM.INV(probability, μ, σ)

x = NORM.INV((0.1,31000,2700) = 27539.81 ~ 27540

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