...the typical DSLR owner has between 2 to 3 lenses in their kit bag on average.
On average. But I bet the distribution not normal - a sharp peak at 1 lens (lots of people buy the body+lens kit and stick with that), and trailing shoulder from 2 on up, meaning if you buy a second lens you're pretty likely to have 3-4 total.
I have the impression 2 & 3 lenses kits are popular. E.g. two of my cousins bought Canon's two lenses kit (18-55mm + 55-250mm), a guy who bought a D90 + similar pair of lenses + 16mm fisheye(!) from ebay before going to a first photography course, etc. Then I've seen a lot of people buy a kit with one lens, then buy a cheap telephoto, say 75-300mm.
I wouldn't be surprised if the peak was around 2-3, falling sharply at 4.