The normal distribution is arguably the most important concept in statistics. Everything we do, or almost everything we do in inferential statistics, which is essentially making inferences based on data points, is to some degree based on the normal distribution. And so what I want to do in this video and in this spreadsheet is to essentially give you as deep an understanding of the normal distribution as possible. And the rest of your life, if someone says, oh, we're assuming a normal distribution, you're like, oh, I know what that is. This is the formula, and I understand how to use it, et cetera, et cetera. So this spreadsheet, just so you know, is downloadable at www.khanacademy.org slash downloads slash, and if you just type that part in, you'll see everything that's downloadable. But then downloads slash normalintro.xls.