A random sample of a town population is summarized by the following frequency distribution:
Age (years) Number of Residents
0≤≤x < 20 620
20≤≤x < 40 800
40≤≤x < 60 550
60≤≤x < 80 400
80≤≤x < 100 130
Find the areas of the regions from your histogram that include only the data that lie within one standard deviation of the mean :
Area of Box 1: Area of Box 2:
Area of Box 3: Area of Box 4:
Total Included Area:
What percent of the data falls within one standard deviation of the mean? (Round to 2 decimals) %