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20. Roadworthy tires last an average of 30,000 miles with a standard deviation of 2500 miles. What proportion of these tires last 28,000 miles or

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20. Roadworthy tires last an average of 30,000 miles with a standard deviation of 2500 miles. What proportion of these tires last 28,000 miles or less? Round to two decimal places. 23 HW & Project Packet 55 Fall 2020 -3 -2 -1 1 2 3 7

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