We have another Guesstimation special for you. As a reminder, we are posting these problems in support of Math Awareness Month which this year is celebrating Mathematics, Statistics, and the Data Deluge. One way anyone can deal with huge amounts of data is estimating — a skill that is examined and taught in much greater detail in Lawrence Weinstein and John Adam’s book, Guesstimation: Solving the World’s Problems on the Back of a Cocktail Napkin. |

# Question #3

#### On average, how many people are airborne over the US at any given moment?

**Hint:** Don’t choose 3:00 AM, choose sometime during the day.

If you like this, try your hand at the other Guesstimation problems:

- If all the humans in the world were crammed together, how much area would we require? http://blog.press.princeton.edu/2012/04/12/what-would-you-do-with-all-that-data-guesstimation-1/
- How massive is a mole of cats? http://blog.press.princeton.edu/2012/04/17/guestimation-2/