How to find middle number? -edit

[Inno]

Hey, for my project, I need to make a line of best fit, and to do that I am going to need to take the 5 sets of coordinates and find the middle number. For example,

X | Y

1 10
2 8
3 4
4 6
5 1

What i mean by middle number would be: for X it would be 3 and for Y it would be 6. (EDITED TO MAKE IT MORE CLEAR) IS there a mathematics formula I could use? Or a piece of coding that would determine this for me? Thanks.
P.S - Yes I know that "Middle Number" isnt correct terminology, I just cant think of the correct term right now

[Martin Wilson]

The Median is what you want. Of the top of my head you would need to sort them and then the middle value would be the one you want.

[Inno]

Yes! Median!
Ok, sort them...should i use a < or > If statement for all of them to put them in order? (remember im a newb)

[NotLKH]

Originally posted by Guv
Least squares fit equations are as follows.

Sum(Yi) = b*n + m*Sum(Xi)
Sum(Xi*Yi) = b*Sum(Xi) + m*Sum(Xi2)

Solve the above for m & b.

n is the number of data points, and the sums are for i = 1 to n.

Page down for "Line of best fit"

[Inno]

Thanks for the help guys, Ive finished my final product that im handing in! It works, though it is not an exact line of best fit, it represents one, which is what the lab required! Have a look!