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!
The average person contains more than one heart (due to late term pregnant women)
And more than one skeleton.
What is tripping you up exactly? Most statistics are population level averages, so they are divided by a large number.
