Does it sound correct or like misinformation to you there has only been 7 female mass shooters in US history?

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According to that website between 1979 and 2023 (44 years) there has only been 7 female mass shooters in the USA.
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For a country that has been in the top 5 most populated countries in the world for decades 7 female mass shooters is quite low.
Does it sound correct or like misinformation to you there has only been 7 female mass shooters in US history?
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