Question: Can you please write which formula this problem uses? A random sample of 50 cars in the drive thru of a fast food restaurant revealed

Can you please write which formula this problem uses?

A random sample of 50 cars in the drive thru of a fast food restaurant revealed an average bill of $ 18.21 per car, The population standard deviation is $ 5. 92. Estimate the mean bill for all cars from the drive - thru with 98% confidence

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