EDIT: Thanks for the answers
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These things are averages, and the average of integers can be a non-integer. If two women have one child each and a third woman has two children, the average woman has 1.33 children. Is that what you meant?
my fav example is that the average person has ~1 testicle!
My favourite is that the average amount of legs is less than 2. So most people have an above average amount of legs.
