The tread life of a particular brand of tire is a random variable best described by a normal distribution with a mean of 70,000 miles and a standard deviation of 1200 miles. What warranty should the company use if they want about 94% of the tires to outlast the warranty?
A.
15,548 mi
B.
71,866 mi
C.
68,134 mi
D.
71,200 mi
E.
68,800 mi