In a study of checkout scanning systems, samples of purchases were used to compare the scanned prices to the posted prices. Table 1 summarizes results for a sample of 819 items. Based on these data, what is the probability that a regular-priced item has a scanning error? What is the probability that an advertised-special item has a scanning error?

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TABLE 1 Scanner Accuracy Regular-priced items Advertised-special items Undercharge Overcharge 20 7 15 29 Correct price 384 364