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24 January, 12:46

A company advertises two car tire models. The number of thousands of miles that the standard model tires last has a mean / mu_S = 60μ S = 60 and standard deviation / sigma_S = 5σ S = 5. The number of miles that the extended life tires last has a mean / mu_E = 70μ E = 70 and standard deviation / sigma_E = 7σ E = 7. If mileages for both tires follow a normal distribution, what is the probability that a randomly selected standard model tire will get more mileage than a randomly selected extended life tire?

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  1. 24 January, 13:15
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