The table gives the population of the 5 largest countries in the European Union in the year 2014. Which of the following is closest to the mean population of these countries?

To find the mean, find the total population of all 5 countries and divide by the total number of countries: 65.9 + 80.8 + 60.8 + 46.5 + 64.3 = 318.3 and 318.3 ÷ 5 = 63.66, which rounds to 63.7. The values in the table are given in millions, so the mean population is about 63.7 million.