(9) In a study of check scanning systems, samples of purchases were used to compare the scanned prices vs. posted and advertised prices. The table below summarizes results for a sample of 819 items scanned. Based on the data presented, what was the probability that a regular-priced item had a scanning error? What was the probability that an advertised-special item had a scanning error? Any additional comments on customer impact from your review of the data? Undercharge Overcharge Correct Price Scanner Accuracy Regular-Priced Items 20 15 384 Advertised-Special Items 7 29 36

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