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The Crossett Trucking Company claims that the mean mass of its delivery trucks when they are fully loaded is 2250 kg and the standard deviation

The Crossett Trucking Company claims that the mean mass of its delivery trucks when they are fully loaded is 2250 kg and the standard deviation is 70 kg. Assume that the population follows the normal distribution. Fortytrucks are randomly selected and their masses measured. Within what limits will 99% of the sample means occur?

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