Doing research for insurance rates
Doing research for insurance rates, it is found that those aged 30 to 49 drive an
average of 38.7 miles per day with a standard deviation of 6.7 miles. These distances are normally distributed. If a group of 60 drivers in that age group are randomly selected, what is the probability that the mean distance traveled each day is between 38.0 miles and 39.9 miles?