SOLUTION: 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 1900 miles. What w
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Question 1169236: 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 1900 miles. What warranty should the company use if they want 96% of the tires to last longer than the warranty? Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! Want the 4th percentile z of a normal distribution, and 96% will be above that number
z=(x-60000)/1900=-1.75
x-60000=-3326
x=56674 miles
