Sure Stone Tire Company Has Established That the Useful Life

Multiple Choice

Sure Stone Tire Company has established that the useful life of a particular brand of its automobile tires is normally distributed with a mean of 40,000 miles and a standard deviation of 5000 miles.What is the probability that a randomly selected tire of this brand has a life between 30,000 and 50,000 miles?

A) 0.5000
B) 0.4772
C) 0.9544
D) 0.9772
E) 1.0000