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According to a survey, the workers employed in a processing industry earn an average of $550...

According to a survey, the workers employed in a processing industry earn an average of $550 per week. Assume that this mean is based on a random sample of 1000 workers selected from the processing industry and that the population standard deviation of weekly earnings is known to be $75. Find a 99% confidence interval for the mean weekly earnings of all workers employed in processing industries.

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