SOLUTION: The top-selling Red and Voss tire is rated 60000 miles, which means nothing. In fact, the distance the tires can run until wear-out is a normally distributed random variable with a

Question 1192853: The top-selling Red and Voss tire is rated 60000 miles, which means nothing. In fact, the distance the tires can run until wear-out is a normally distributed random variable with a mean of 71000 miles and a standard deviation of 6000 miles.
A. What is the probability that the tire wears out before 60000 miles?
Probability =
B. What is the probability that a tire lasts more than 76000 miles?
Probability =

Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
z=(x-mean)/sd
<(60000-71000)/6000
=-11000/6000 or -11/6
the probability z < -11/6=0.0334
-
z>5000/6000 or 5/6
probability of 0.2023
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