On those rates 0.05 people in a room of 400 would be shot per year, so 1 person per 20 years.
It’d 1 person every 2 years in a room of 4,000.
Also those mental health numbers are off given the lifetime prevalence of most disorders being around 5%.
2/400 (0.5%) of the population identifying as trans would be 1,665,000 people - which may be plausible but idk, I generally work on the figure of ~4% of any population being LBGTQI.