As Cohn says, individual polls are likely to fall on a bell curve. I’ve recreated his chart below, with actual recent polls in blue. As you can see, it’s all perfectly normal (pun intended).

How to Put a Gaussian Curve on a Graph in Excel. Gaussian curves, normal curves and bell curves are synonymous. Each represents how statistical data with normal distribution plots on a graph.

With that, Excel can generate a series of random numbers based on the data entered and the standard deviation. With this data you can then create a curved chart, known as a bell curve.