Price scanners at the checkout register sometimes make mistakes, charging either more or less than the labeled price.20 Suppose that a scanner is wrong 4% of the time, with half of the errors in favor of the store and half in favor of the customer. Assume that an error in favor of the store means that the scanned price is 5% above the listed price and an error in favor of the customer means that the scanned price is 5% below the listed price. How would these errors affect the distribution of the prices of sold items?
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