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The population standard deviation is $5.68. A random selection of 180 cars in the drive-thru of a popular fast food restaurant revealed that the average

The population standard deviation is $5.68. A random selection of 180 cars in the drive-thru of a popular fast food restaurant revealed that the average bill of $21.04 per car. Estimate the average bill for all cars from the drive-thru with 88% confidence

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