How many people have to be in a room for there to be a 50% chance that at least 2 people have the same birthday (there are 366 possible birthdays (feb 29) and each birthdate is equally likely to occur). Note: Approach it from the perspective of adding one person to a room at a time and how the universe changes each time someone new comes to the room

The table shows life expectancy in years of the G8 countries (Datablog, Guardian.co.uk, July 8 2009). Treating the data as a population, calculate the zscore for life expectancy in Russia.

Canada 81

China 73

France 81

Germany 80

Italy 81

Japan 83

Russia 66

United Kingdom 79