Greatmonth Tire Company has tested its new Roadslogger® all-weather tire, and found that it has an average life of 64,000 miles with a standard deviation of 4,000 miles.

a) If Greatmonth Tire has a full guarantee for 60,000 miles, what percentage of all tires sold would they expect to replace?

b) If Greatmonth Tire wanted to replace 5% or fewer of their tires, how long should the warranty be?

Answer rating: 100% (QA)

To solve these problems well use the normal distribution since the average life of the tires is norm... View the full answer