Assume you tested several automobile tires and recorded a Chi-sq. test you decide that miles until failure are normally distributed with mean failure of 50 000 miles and the standard deviation of failures was 10 000 miles.a) Determine the reliability of the tires at 40 000 miles.b) If you know one of these tires has been driven 20 000 miles (on a testing machine) what is its reliability at 60 000 miles?
