Indeed, numbers on their own are meaningless. Based on this graph, private schools make up 10% of the enrollments. Public schools are 83% and charter schools make up the remaining 7%.
I have no idea where the charter schools are counted when it comes to school shootings though. If they are counted as public we get
Private: 24/10 = 2.4 shootings per percent of enrollment
Public: 392/(83+7) = 4.36 shootings per percent of enrollment
and if they are counted as private we get
Private: 24/(10+7) = 1.41 shootings per percent of enrollment
Public: 392/83 = 4.72 shootings per percent of enrollment
So either way the public schools have more shootings by almost a factor 2 at least.
I don't know if this applies to you, but don't use the compression flag (-z) for files that already is compressed (like video). The transfer will get CPU bound quickly if you have a fast internet connection.
I went from 13 Mbytes/s to 200 by removing the -z flag, and the compression ratio was non-existant anyway.
Lisan al gaib!