Drivers’ licenses 2011 The table on the next page shows the number of licensed U.S. drivers (in millions) by age and by sex (www.dot.gov).  a) What percent of total drivers are under 20? b) What...

Drivers’ licenses 2011 The table on the next page shows the number of licensed U.S. drivers (in millions) by age and by sex (www.dot.gov).

 a) What percent of total drivers are under 20?

b) What percent of total drivers are male?

 c) Write a few sentences comparing the number of male and female licensed drivers in each age group.

 d) Do a driver’s age and sex appear to be independent? Explain.