slimboyfat, the information can never be "wrong", that's a slanderous thing to say. You make it sound like I'm trying to mislead people. How can that be so when I provide the equation for my data in the OP so that people can verify the results from their own yearbooks? The information can never be "wrong", because maths doesn't lie. If you think the equation is irrelevant, fine. If you think the title given to the data produced is misleading, fine I'll change it (although you still haven't given me a title to the data that would help you sleep better).
I can't really go further in this discussion when you're going off on a crazed tangent telling me my data is "wrong" when it quite clearly isn't. Irrelevant in your point of view? Perhaps. Wrong? Absolutely no way.
Let's clear that up before I have another go at explaining things to you in a way that you will understand. It helps if you read what I write properly though, which I don't think you're doing.