A production process that fills 12-ounce cereal boxes is known to have a population standard deviation of

Question:

A production process that fills 12-ounce cereal boxes is known to have a population standard deviation of 0.009 ounces. If a consumer protection agency would like to estimate the mean fill, in ounces, for 12-ounce cereal boxes with a confidence level of 92% and a margin of error of 0.001, what size sample must be used?

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