It is claimed that automobiles are driven on average more than 20,000 Km per year. To test this claim, 100 randomly selected automobile owners are...

It is claimed that automobiles are driven on average more than 20,000 Km per year. To test this claim, 100 randomly selected 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 23,500 Km and a standard deviation of 3,900 kilometers? Use a 0.01 level of significance.