calculating lift co efficient using integration

Hi guys, i really need help with this. any advice would be appreciated.

It looks like uni coursework/assignment and with a bit of googling I can guess what the last two columns are and the length of the aerofoil and I can only presume the columns are measurements at different places, but Im really unsure? Id guess theyre asking you to integrate along the aerofoil length, but I could be way off. It almost goes without saying that you should post the full question and be clear about what you know/have been taught about calculating lift coefficients and what youre unsure about.
However, surely the easiest/best thing for you to do is to ask your tutor/lecturer for appropriate advice.

im just confused as to what the x will be?

As youve only posted the data without the question/description, its "impossible" to say.

have a look now, hopefully should be clear now thanks.
im confused as to what Xn will be?

I know what the trapezoidal rule is, but youve not said what the columns in your data set are. As in #1, id guess youre doing the the trapezoid rule for each row (over the 14 columns) but as Ive no idea what they represent, I could be very wrong.

they are the heights of each point

Heights of what and how is one column related to the next and so on ...

can you see the red rectangles? the height of these so we measured the height of each one 1,2,3 etc.
the angles of attack -4,0,8,16 we changed by turning a switch so the heights would change each time for the angles of attack, we then measured the heights.
Does that make sense?