The average number of miles a person drives per day is 24. a researcher wishes to see if people overage 60 drive less than 24 miles per day.she selects a random sample of 49 drivers over the age of 60 and finds. that the mean number of miles driven is 22.8. The population standard deviation is. 3.5 miles. At a=0.05 is there sufficient evidence that those drivers over 60 years ild drive less on average than 24 miles per day?