3 points Scores on a test are normally distributed with a mean of 520 and a standard deviation of 50. George scores 472 on the test. He was in which percentile approximately? O 16th percentile O 34th percentile O 18th percentile 820 percentile Previous points The gas mileage for a particular type of car is known to have a standard deviation I mile. For a fixed speed (65 miles hour) 16 cars were tested and found to get an average of 24.3 miles per gallon. What is the z-test statistic for the null hypothesis Hoj 25 miles per gallon? O 2.8 0 14 O 1.4 Next Previous