Each month the Bureau of Labor Statistics reports the number of people (in thousands) employed in the United States by age. The accompanying frequency distribution shows the results for August 2011. Age Frequency
16 to 19 4,794
20 to 24 13,273
25 to 34 30,789
35 to 44 30,021
45 to 54 32,798
55 and over 28,660
a) Construct a relative frequency distribution. What proportion of workers is between 20 and 24 years old?
b) Construct a cumulative relative frequency distribution. What proportion of workers is younger than 35 years old?