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Charts and Graphs

Create Bar Graphs

A Bar Graph is a graph consisting of parallel, usually vertical bars or rectangles with lengths proportional to the frequency with which specified quantities occur in a set of data. Also called bar chart.

HOW TO DRAW A BAR GRAPH

Step 1. Look at your data to determine how big your bar graph should be and whether horizontal or vertical bars will fit better on your paper. Decide the scale your bar graph will have. This is determined by the biggest and the smallest numbers in your data set.

Step 2. Decide how wide the other axis should be to show all of the type of data. Label this axis of your graph.

Step 3. Draw the rectangles the right length to represent the data. Pick a good width for the data bars. Color coding can make a graph easier to read.

Step 4. Give your graph a title

Make a vertical bar graph of the data.

 Instrument Frequency clarinet    flute    trumpet    violin 11      18        7        5

Step 1  Decide on the scale and interval.  The data includes numbers from 5 to 18.
So, a scale from 0 to 20 and an interval of 4 is reasonable.

Step 2  Label the horizontal and vertical axes.

Step 3  Draw bars for each instrument.  The height of each bar shows the number of students who play that instrument.

Step 4  Label the graph with a title.