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The weight of a food package is normally distributed with a standard deviation of 17.3 ounces. The sample mean of 25 packages is 75.0 ounces.

The weight of a food package is normally distributed with a standard deviation of 17.3 ounces. The sample mean of 25 packages is 75.0 ounces. Find the sample size required for a 90% confidence interval to have a width of 2.8 ounces

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