1. A trucking rm suspects that the average lifetime of 25,100 miles claimed for certain tires is too high. To test the claim, the rm puts a random sample of 100 of these tires on its trucks and later nds that their mean lifetime is 24,521 miles and the standard deviation is 2,631.8 miles. (a) Set up the null and alternative hypotheses for this situation (it should be one-sided)