It's the median, not the mean. Here's the raw data: https://en.wikipedia.org/wiki/Terrorism_in_the_United_States https://en.wikipedia.org/wiki/Terrorism_in_th

It's the median, not the mean. Here's the raw data: https://en.wikipedia.org/wiki/Terrorism_in_the_United_States https://en.wikipedia.org/wiki/Terrorism_in_the_United_States The median is more relevant than the mean simply because it's less sensitive to outliers. 9/11 was an outlier; 85% of all U.S. terrorist deaths in the last 50 years happened on that one day.