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A company determines that the lifespan of it's car engine is normally distributed with a mean of 150 000km and a standard deviation of 10

A company determines that the lifespan of it's car engine is normally distributed with a mean of 150 000km and a standard deviation of 10 000km. For how many kilometres should the company warranty the car engine so that the company will only have to replace fewer than 2.5% of the engine?

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