today is deadline of this assignment .plz solve this question as soon as possible.

Q No 1: a) An automobile manufacturer claims that his cars consume an average of four gallons of gas for each 100 miles. A consumer organization tested 49 of his cars and found that the mean in 4.15 gallons with standard deviation of 0.49 gallon 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. (7)