Help on this. Thanks

The Crossett Trucking Company claims that the mean mass of its delivery trucks when they are fully loaded is 2800 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 95% of the sample means occur? (Round the final answers to the nearest whole number.)

Sample means__________ to _________

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