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Here’s a new way to organize data!

Person-playing-video-games

The company Gameger specializes in producing single- and multi-player action and strategy games. During the last week, there were 500 downloads of Gameger games from an app store. Of those 500 downloads, 65 were single-player action games, 135 were single-player strategy games, 125 were multi-player action games, and 175 were multi-player strategy games.

How can Gameger organize this data into a single, easily readable table?

In order to visualize their data, Gameger could construct a two-way frequency table (also called a contingency table). Two-way frequency tables represent the possible relationships between two sets of data. For Gameger, the two sets of data are the type of game downloaded and whether the game is a single- or multi-player format.

Single-player Multi-player Total
Action 65 125 190
Strategy 135 175 310
Total 200 300 500

You can use two-way tables to organize data and also to compute certain types of probability.

You already know how to compute theoretical and experimental probability.

Theoretical Probability

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Probability that is determined on the basis of reasoning. Examples include tossing a fair coin and rolling fair dice.

Experimental Probability

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Probability that you observe from data.


In this lesson, you will expand what you know about computing probability. You will also learn how to recognize different kinds of events, and you will construct and use your own two-way frequency tables.