Emily Poskett works as a government statistician for the Department for International Development. With lots of travel and the opportunity to make a real difference in poorer countries, her job is far more than just number crunching.
Did you know that you can't average averages? Or that Paris is rainier than London ... but it rains more in London than in Paris? Andrew Stickland explores the dangers that face the unwary when using a single number to summarise complex data.