Discrete random variables

Discrete random variables occur in situations where we can list every possible outcome of a process, and assign each outcome a probability in a probability model. For example, how many heads will we get in three flips? We'll learn how to make a probability distribution, find some probabilities, and calculate the mean (or expected value), variance, and standard deviation of a random variable.

Random variables

Discrete and continuous random variables

Constructing a probability distribution for random variable

Constructing probability distributions

Probability models example: frozen yogurt

Probability models

Valid discrete probability distribution examples

Probability with discrete random variable example

Probability with discrete random variables

Mean (expected value) of a discrete random variable

Expected value

Mean (expected value) of a discrete random variable

Variance and standard deviation of a discrete random variable

Standard deviation of a discrete random variable