standard deviation

UB ForumCategory: Statisticsstandard deviation
Chen BoChen Bo Staff asked 6 years ago

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 2900 miles. What warranty should the company use if they want 96% of the tires to outlast the warranty?

A) 57,100 mi

B) 54,925 mi

C) 65,075 mi

D) 62,900 mi

1 Answers
Best Answer
Selena TateSelena Tate Staff answered 6 years ago

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 2900 miles. What warranty should the company use if they want 96% of the tires to outlast the warranty?
Solution: 54,925 mi