The most recent study, from '94, showed 25% of adults in the U.S. own guns. That's about 54,450 million citizens! Numbers for the whole world are impossible.
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In 2005 there were 14,916 men who used a gun to end their own life. The same year, there were 2086 women who used guns.
These are all measure sof central tendency or most likely events. When considering evidence, you are concerned with the most likely outcome or the least likely outcome. A fact such as the modal gun purchased/owned in a state or district is a measure of the likelihood that a particular gun may not be the one owned by the defendant, as many others also own this model gun. On the other hand, someone who owns a gun that does not fit into one of these three measures (average/middle/most) is likely to be able to suggest that it is not their gun. DNA evidence works at the opposite end of this statistical spectrum, focussing on how many people do not share an attribute rather than on how many people do share an attribute within their DNA.
In many countries people did not own slaves at all.
There were over 350,000,000 sold before Apple stopped releasing sales information in 2015.
Well over 1 Billion and it's expected to be 2 Billion by 2014