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What is the probability that the mean lifespan

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A research company found that the tyre lifespan for the local town vehicles is normally distributed with a mean of 40 000km and a standard deviation of 4000km. If a random sample of 45 vehicles is selected, what is the probability that the mean lifespan of the tyres for these 45 vehicles is between 39 000 and 41 500km?

Reference no: EM132382039

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