So, given that 4 students is equal to 1 cop and that 1 CEO is more or less equal to 30 cop,
We can say that a student is equal to 0.25 cop
So a CEO is equal to 120 students live.
As they have been around 70 victim to school shooting by year and around 300 school shooting for the last 3 years in the USA, we can deduct that the death of a CEO is around 2 year of school shooting combined (not taking into account the wounded) so around 600 school shooting.
Depending on whether you mean Sandy Hook/Columbine type shootings or any shooting that involves any school property in any fashion then either mostly white or mostly black. If you're averaging a school shooting a day, then you're including any shooting involving school property so mostly black but also fewer students than you'd expect (a lot of "school shootings" are just gang violence that involves school property in some fashion and a surprising number are accidental discharge of a concealed carry that hits no one).
You're supposed to set up a system of equations and use substitution or row reduction to solve. It's easy! They let you use a ti-89plus titanium, so make sure you're familiar with how to do this on your calculator.