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The amount of cola dispensed into an ACME Cola bottle is random, with mean 12 oz and standard deviation 0.10 oz. The quality control engineer

The amount of cola dispensed into an ACME Cola bottle is random, with mean 12 oz and standard deviation 0.10 oz.

The quality control engineer randomly samples 45 bottles and finds the mean amount of cola to be 11.9. Do you think the machine needs adjustment? Explain.

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