The middle number has a different meaning to the average number. The former means a number between two other numbers.
Yes. The middle number is called the median in mathematics (as opposed to the mean or average number).
further ahead we had: Ο μέσος άντρας = The average man
and we are told: the middle man is ο μεσαίος άντρας
What is right, when now we have: The middle number = Ο μέσος αριθμός ???
And what about the average man "ο μέσος ορός άντρας"?
Μέσος Όρος (Μ.Ο.) is a number.
(1+2+3+4+5)/5 = 3 = Μ.Ο.