the population standard deviation fro a gas mileage for a certain model of car is known to be 1.8 mi

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the population standard deviation fro a gas mileage for a certain model of car is known to be 1.8 miles per gallon. how many cars would you have to test(what sample would you need)to get a margin of error of 0.5 mile per gallon (or less) for the population mean at a 90%confidence level?

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