Explore population dispersion patterns. Learn the definition of uniform dispersion, random dispersion, and clumped dispersion. Better understand them using examples.

Learn how to calculate the variance of a discrete random variable, and see examples that walk through sample problems step-by-step for you to improve your statistics knowledge and skills.

Learn how to calculate the standard deviation of a discrete random variable, and see examples that walk through sample problems step-by-step for you to improve your statistics knowledge and skills.

Learn about discrete and continuous probability distribution of a random variable. Discover how to make a probability distribution graph for both types of variables.

Learn about spatial distribution. Identify types of spatial patterns, study examples of spatial distribution, and examine what spatial patterns are used for.

Learn how to differentiate between population density and population distribution. Understand population and spatial distribution and see examples of each.

Learn how to combine normal random variables, and see examples that walk through sample problems step-by-step for you to improve your statistics knowledge and skills.

Understand what is a random variable and why it is used. Learn about the types of random variables and see examples of the random variables from everyday life.

Understand expected values in probability. Learn the formula for calculating the expected value of a random variable. See examples of finding the expected value.

The n th moment of a random variable is defined to be the expected value of the n th power of that variable. Higher moments can express additional information about the shape of a distribution.