The following table shows attendance data collected by the Motion Picture Association of America during the period 2009 to 2011. Figures are the number (in millions) of frequent moviegoers in each age group.

a) What percent of all frequent moviegoers during this period were people between the ages of 12 and 24?
b) What percent of the frequent moviegoers in 2011 were people between the ages of 12 and 39?
c) What percent of all frequent moviegoers during this period were people between the ages of 18 and 24 who went to the movies in 2009?
d) What percent of frequent moviegoers in 2010 were people 60 years old and older?
e) What percent of all frequent moviegoers in this period were people 60 years old and older who went to the movies in 2010?
f) Compare the conditional distributions of the age groups across years. Write a couple of sentences summarizing what you see.

Age 9 2-11 12-17 18-24 25-39 40-49 50-59 60+ 2011 2.5 5.7 6.6 9.7 3.3 3.1 4.1 2010 6 74 77 3.5 3.0 43 2009 28 5.7 3 63 45 2.9 3.4