Final answer:
The question seeks information on mean voter turnout by decade in six established democracies from 1950 to 2014. The answer provides details on voter turnout rates in the United States and other OECD member nations, including the influence of age groups and race/ethnicity.
Step-by-step explanation:
The question is about mean voter turnout by decade in six established democracies from 1950 to 2014. The student is seeking information on the topic of voter turnout rates in different time periods. The provided figures and sources give information about voter turnout rates in the United States and other OECD member nations, showing the trends and variations in voter turnout over time. The data also highlights the influence of age groups and race/ethnicity on voter turnout.