Countries of the world statistics

Use this site:
http://world-statistics.org/

http://www.nationmaster.com/ or this site http://data.worldbank.org/indicator or this site http://unstats.un.org/unsd/default.htm

Find the following information

-top 5 countries in terms of GDP
-Lowest 5 countries in terms of GDP
-Country with the highest population. list the number
-highest and lowest literacy rates
-highest and lowest mortality rates
-Highest and Lowest life expectancy of men and women
-find some other interesting statistics and report them

Think about the following:

What does this data show?
What can we infer about a country based on its GDP, literacy rate, mortality rate?