Q: Were None of 154 Mass Shootings in 2018 Committed by a Black Man, Illegal Alien, or Woman?
A: Mixture.
The answer should be entirely false. If you measure by suspects, two-thirds of shooters in the 154 shootings were black men. If you measure by convictions, there were zero mass shootings in 2018. By any measure you choose, the claim is incorrect, and probably by a very wide margin.
Example 2: https://www.snopes.com/fact-check/united-states-lower-death-...
Claim: Between 2009 and 2015, the United States had a lower mass shootings death rate than several European countries.
Rating: Mixture
The analysis is extremely muddled, and claims that the European shootings were "outliers" and therefore presumably should not be counted, rather than relying on the law of large numbers.