I get about 10+ if it's a college day - depends how many times I check my 3DS. Most of the time I turn off my wireless though as I don't want other people's villagers via Streetpass.
Almost never. In fact, I was surprised when I checked my 3ds after a trip to the bookstore (I decided to bring it for the step counter to get fortune cookies), and saw that I had passed 3 people for AC:NL; that was a lot to me. Most people I streetpass are playing pokemon.
That, or Bravely Default; should I ever play that game again, I'll be getting tons of extra villagers (I don't need since everything is completed) for Norende. >.>
I haven't had any, I don't take my DS with me anywhere. I keep meaning to when I'm going to places like the mall but then I forget since I'm only used to grabbing my phone and purse
I live in an area where I don't think there's many people who play games and such so unless I got into the center of the city (which is a huge pain cus of traffic) I never get streetpasses. I've never gone to a convention with my DS in my bag as I'm always wary of it going missing but I might try that out next time I got to a con to see if I finally get some.
I get 1 - 2 daily from the other 3DS in our house. But 'real' streetpasses I only really get on days out, like in cities, or at Nintendo Zone places like McDonalds. Sometimes I'll randomly get them when driving through town to do grocery shopping, but that's once in a blue moon unless it's during the school holidays.
I take my 3DS basically everywhere. I get the most when I go to McDonalds, though. Usually 5 at least. Maybe because it's a "Nintendo Zone"? I also get tons when I go to conventions!
I can usually get a couple when I go to campus, or to the mall. I streetpass the employees at EB Games a lot, haha.
I always have my 3ds on me when I travel to visit my parents. I always have to wait around the departures in Union station in Toronto and I can usually fill up my streetpass a couple of times if it's busy there.
I used to carry mine around so I could build up the play coins, and I'd get a ton riding the metro. There was also a neighbor in my old building who played, but I couldn't figure out who irl. Now I live in an older neighborhood and drive and leave my gameboy at home and it's lonely. I should carry it in my handbag.