The average number of miles driven each day by a group of drivers is 20.7 miles with a standard deviation of 6.5 miles. If you randomly select 50 drivers, what is the probability that the average...

The average number of miles driven each day by a group of drivers is 20.7 miles with a standard deviation of 6.5 miles.  If you randomly select 50 drivers, what is the probability that the average number of miles driven each day is between 19.4 and 22.5 miles?  Round your answer to 4 decimal places.