The mean lifetime of a certain tire is 20,000 miles and the standard deviation is 1000 miles. (Give your answers correct to one decimal place.) (a) If we assume the mileages are normally distributed, then approximately what percentage of all such tires will last between 17,000 and 23,000 miles? % (b) If we assume nothing about the shape of the distribution, then at least what percentage of all such tires will last between 17,000 and 23,000 miles? %

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