13 the tread life of a particular brand of tire is a random variable b
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13) The tread life of a particular brand of tire is a random variable best described by a normal distribution with a mean of 60,000 miles and a standard deviation
of 8200 miles. If the manufacturer guarantees the tread life of the tires for the first 50,160 miles, what proportion of the tires will need to be replaced under warranty?