Familiar with all 30 people but could only recognise 20 of them (67%), so below average but probably not problematically so. Having said that, I have found myself on occasion talking with someone thinking they were someone entirely different, which was embarrassing to say the least. I do find that increasingly I seem to be surrounded by people who I think I probably know, but have no idea from where, so have to bluff much of the time. This probably comes across as rude, even though unintentional.