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 2100 miles. What is the probability a...

 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 2100 miles. What is the probability a particular tire of this brand will last longer than 57,900 miles?


A) .8413 B) .2266 C) .1587 D) .7266