Normal Distribution Curve

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<b>There are three kinds of lies. Lies, Damn Lies, and Statistics.</b>

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Aaah, the Normal Distribution Curve. This is a <b><i>statistical principle</i></b> that underpins much of the assumptions of Economists and Psychologists. Strange bedfellows, I'll admit, but there you have it.

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The Normal Distribution Curve is a wonderful thing that was pretty much invented by a gentleman called William Bell. This explains why it's often called the <b>Bell Curve</b> instead of the normal distribution curve.

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The Bell Curve is simply the curve you get if you take an infinite population of anything and measure the frequency of something occuring in it. Complicated it is, so here's an example:<BR/>
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<b>Example One.</b><BR/>
Assume you have a population of guinea pigs. Now assume that guinea pigs die, on average, at the age of 15. If you calculated the liklihood
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