To use a variable, we must both declare it—to let the program know about the variable—and then assign it—to let the program know what value we are storing in the variable.

Variables in math are symbols, often letters, that represent different values in various situations. They help us understand and solve problems with changing values.

Variables in math are symbols, often letters, that represent different values in various situations. They help us understand and solve problems with changing values.

In programming, a variable is like a box where you can store information (like a number or a word). This information can be changed later on (whereas a constant keeps the information it was assigned to …

Random variables are really ways to map outcomes of random processes to numbers. So if you have a random process, like you're flipping a coin or you're rolling dice or you are measuring the rain that …

Many studies and surveys consider data on more than one variable. For example, suppose a study finds that, over the years, the prices of burgers and fries have both increased.

Introduction to variables Learn What is a variable? Why aren't we using the multiplication sign?

In algebra, we use variables like x, y, and z to represent unknown values. Expressions are combinations of variables and numbers, while equations equate two expressions.

For a variable to be binomial, does each trial need to have the same probability of success, or is it enough that each trial has an independent constant probability of success?

A single quantity should be represented by only one variable, so you should not have two different variables used for the same thing. So if a question talks about finding Andy's age, you cannot use a …