There has been, on average, 1 school shooting every week this year

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We’re only 20 weeks into 2018, and there have already been 22 school shootings where someone was hurt or killed. That averages out to more than 1 shooting a week.
The parameters CNN followed in this count are:A shooting that involved at least one person being shot (not including the shooter)
A shooting that occurred on school grounds
We included grades K through college/university level
We included gang violence, fights and domestic violence
We