Many scores are derived from the normal distribution, including percentile ranks (percentiles or quantiles), normal curve equivalents, stanines, z-scores, and T-scores.

Jan 20, 2025 · What is a Bell Curve? A bell curve, also known as a normal distribution curve or Gaussian curve, is a symmetrical probability distribution that resembles a bell shape. It's one of the …

Dec 27, 2025 · Normal distribution is a continuous probability distribution that is symmetric about the mean, depicting that data near the mean are more frequent in occurrence than data far from the …

Graph functions, plot points, visualize algebraic equations, add sliders, animate graphs, and more.

Dec 8, 2025 · The graph of the normal distribution is characterized by two parameters: the mean, or average, which is the maximum of the graph and about which the graph is always symmetric; and …

Data can be "distributed" (spread out) in different ways. But in many cases the data tends to be around a central value, with no bias left or right, and it gets close to a "Normal Distribution" like this: The blue …

The normal distribution, also called the Gaussian distribution, is a probability distribution commonly used to model phenomena such as physical characteristics (e.g. height, weight, etc.) and test scores. Due …

Apr 30, 2018 · Height data are normally distributed. The distribution in this example fits real data that I collected from 14-year-old girls during a study. The graph below displays the probability distribution …

Explore interactively the properties of the normal distribution curve by changing the mean and standard deviation.

You can explore the concept of the standard normal curve and the numbers in the z-Table using the following applet. The (colored) graph can have any mean, and any standard deviation. The gray …