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Introduction to Probability

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Videos, worksheets, games and activities to help Algebra II students learn about probability.

What is Probability?
The probability of an event represents the likelihood it will occur.
Probability compares the favorable number of outcomes to the total number of outcomes. \[P(E) = \frac{{{\rm{favorable\: number\: of\: outcomes}}}}{{{\rm{total\: number\: of \:outcomes}}}}\]
The favorable number of outcomes is called the event.
The total number of outcomes is called the sample space.
Probability can be expressed as a fraction, decimal, or percentage.

There are two types of probability:
1. Theoretical probability is found using mathematics.
2. Experimental probability is found by conducting an experiment.

Introduction to Probability
In statistics, a fundamental concept found in the introduction to probability. When dealing with the introduction to probability, students first encounter basic problems that calculate the likelihood of an event occurring, an event such as drawing a specific card from a deck. Terms from an introduction to probability include an event, its complement and the sample space.

This video introduces probability and determine the probability of basic events.
Probability explained | Independent and dependent events
We give you an introduction to probability through the example of flipping a quarter and rolling a die.

Calculating the Probability of Simple Events.
This video shows the basic idea and a few simple examples of calculating the probability of simple events.
What is probability?


Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

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