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 73000 miles and a standard deviation of 5000 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 81000 miles?
Probability =
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