Learning statistics means keeping a lot of formulas, theories, and rules of thumb in your head at once, and it’s easy to lose track of the one you need right when you need it. That’s why we’re launching Statology Fact Sheets, a new series of one-page guides that gather the essentials of a topic into a single, easy-to-scan page. First up is the distribution that shows up almost everywhere in statistics: The Normal Distribution, by the numbers.

The sheet walks through the bell curve from different angles: how its shape is defined, how values spread out around the center, the reference numbers you’ll reach for again and again, and a few practical tools for putting it all to work. It also covers why the normal distribution matters even when your data doesn’t look normal, and what to do when you’re not sure whether it does. Everything is laid out visually and in plain language, so you can find what you need at a glance instead of digging through a textbook.

Whether you’re working through homework, reviewing before an exam, or double-checking an analysis at work, this is the kind of page worth keeping within reach. Print it, pin it next to your desk, or keep it open in a tab, and grab your copy of the normal distribution fact sheet today. More Fact Sheets are on the way, so stay tuned for the next one.