Rate could mean over time or percentage of. I think OP was thinking of time, in which case your wouldn’t need the total number of schoolchildren. Just divide the population of billionaires by the number of schoolchildren that die by violent crime per year.
I haven’t actually done the math, but by percentages I think they are probably fairly close.
Its not hard to look up school shooting fatalities, but it would be depressing
In total, you’d only need four numbers:
Rate could mean over time or percentage of. I think OP was thinking of time, in which case your wouldn’t need the total number of schoolchildren. Just divide the population of billionaires by the number of schoolchildren that die by violent crime per year.