Meat Consumption

Algebra Level pending

A marketing research company desires to know the mean consumption of meat per week among people over age 31. They believe that the meat consumption has a mean of 4.7 pounds, and want to construct a 80% confidence interval with a maximum error of 0.09 pounds. Assuming a variance of 0.64 pounds, what is the minimum number of people over age 31 they must include in their sample?

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