What is a bar graph?
Here is an example of a bar graph
http://www.google.com/search?hl=en&ie=ISO-8859-1&q=bar+graph&btnG=Google+Search
the screen on a stereo is a bar graph
A bar graph is a type of chart that displays categorical data using rectangular bars. It is used to compare and represent data in a visually appealing and easy-to-understand format. The length or height of each bar represents the quantity or value being measured, while the categories or groups are typically displayed on the x-axis.
To create a bar graph, you can follow these steps:
1. Determine the categories or groups you want to represent on the x-axis. For example, if you are comparing the sales of different fruits, the categories could be apples, oranges, and bananas.
2. Decide on the range or values that will be represented on the y-axis. This could be the total sales in dollars or the number of units sold, depending on the data you have.
3. Draw a horizontal line for the x-axis and a vertical line for the y-axis, labeling them accordingly.
4. Choose a scale for the y-axis, ensuring that it can accommodate the values you will be representing.
5. For each category, draw a rectangular bar that starts at the baseline (x-axis) and extends upward or to the right (y-axis) to represent the value. The width or length of each bar can be consistent or vary, depending on your preference.
6. Label each bar with the corresponding category, either directly on the bar or adjacent to it.
7. Add a title to the graph to provide a clear indication of what is being represented.
8. Add any necessary legends or additional information to enhance the graph's clarity and understanding.
In terms of the screen on a stereo being referred to as a bar graph, it is likely because the screen displays a series of bars or levels that indicate the current volume level or audio levels for different frequency ranges. Each bar represents the strength or intensity of a particular component of the audio signal.