#2 help me please

Provide an appropriate response. A trucking firm suspects that the mean lifetime of a certain tire it uses is less than 30,000 miles. To check the claim, the firm randomly selects and tests 54 of these tires and gets a mean lifetime of 29,400 miles with a population standard deviation of 1200 miles. At a = 0.05, test the trucking firm's claim. Be sure to include all steps in the answer. Attach or send work to instructor