An automobile manufacturer claims that his cars consumer an aversge of four gallons of gas for each 100 miles. A consumer organization tested 49 of his cars and found that the meab is 4.15 gallons with standard deviation of 0.49 gallons for each 100 miles .At 0.01 level of significance do the data provide evidence that the car really used more than 4 gallons on the average per 100 miles.