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Smithfield Foods is the largest pork producer in the US. They would like to estimate the average weight of young pigs they have. Let us

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Smithfield Foods is the largest pork producer in the US. They would like to estimate the average weight of young pigs they have. Let us suppose the weight of young pigs follow an approximately normal distribution with a standard deviation of 22lbs. How large a sample should be taken to estimate the true mean weight to be within i2lbs. with 90% confidence? (5 pts)

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