It is claimed that an automobile is driven on the average 20,000 kilometers per year with a standard deviation of 4,000 kilometers. To test this claim, a random sample of 100 automobile owners are...

It is claimed that an automobile is driven on the average 20,000 kilometers per year with a standard deviation of 4,000 kilometers. To test this claim, a random sample of 100 automobile owners are asked to keep a record of the kilometers they travel. Would you agree with this claim if the random sample showed an average of 20,480 kilometers? Use a 0.1 level of significance.