There are 29 teams in New Hampshire*. Assume each team has 20 students (some will have less, some will have more), which means there are about 580 FRC students in New Hampshire. The population of New Hampshire (as of 2010) is 1,316,470**.
This means that 0.04% of the population of New Hampshire are FRC students. 0.04% means about 1 in every 2500 people you encounter will have be wearing an FRC shirt IF they wear their shirts every day.
So assuming the students wear their shirts all the time, go shake hands with 2500 people.
*
http://www.usfirst.org/whats-going-o...rch_teams_form
**
http://www.census.gov/popfinder/?fl=33