I didn’t fall for it either.
I assumed he just grabbed the name “Frodo Baggins” to represent a hypothetical male, unrelated to Lord of the Rings.
I got the answer right.… just because 30 is very small and 48 is very large, both seeming to represent smaller portions of society. I figured it was the 32 just based on probability of ‘average size’.
Because when you donate money to a charity (assuming that one does), the idea is that it will go to a CAUSE, not to the charity’s marketing (which is what the study seemed to be.… the charity wishing to learn marketing demographics).