5
This statistic only takes into account the shootings that happened despite there being armed guards, but it doesn't take into account the shootings it deterred or prevented.
If only 1 out of 4 schools where the shootings happened had guards, then it means schools without guards are more likely to be targeted, because the percentage of schools with guards is higher than 1 in 4:
https://www.theguardian.com/us-news/...ng-study-finds
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