Bar graphs, also referred to as bar charts, visually represent grouped data through vertical or horizontal rectangular bars. These bars have consistent widths, with one axis representing the variable quantity and the other axis indicating the measurement of the variable. The height or length of each bar corresponds to the value of the variable, facilitating comparison between different quantities. Bar charts are particularly useful for illustrating frequency distribution tables, simplifying data analysis and comprehension.
Following are the many parts of a bar graph:
Bar graphs can be either upanddown or sidetoside. The important part of a bar graph is how long or tall each bar is. If a bar is longer, it means the numbers are bigger.
In bar graphs, we usually see groups of categories or numbers. They have lines and rectangles. The rectangles show how often different things happen. Sometimes, they show the different things themselves. The lines help us know what each rectangle means. The number of lines on the side or bottom of a bar graph is called the scale.
When the grouped data are represented vertically in a graph or chart with the help of bars, where the bars denote the measure of data, such graphs are called vertical bar graphs. The data is represented along the yaxis of the graph, and the height of the bars shows the values.
When the grouped data are represented horizontally in a chart with the help of bars, then such graphs are called horizontal bar graphs, where the bars show the measure of data. The data is depicted here along the xaxis of the graph, and the length of the bars denote the values.Horizontal Bar Graph
Some of the important properties of a bar graph are as follows:
Bar graphs help us compare things in different groups or see how things change over time. But they work best when the changes are big.
Bar charts have lines and are made so all the information fits on the graph. When the order of the lines doesn't follow a pattern, the bars can be in any order. If the bars go from the biggest to the smallest number, they're called Pareto charts.
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Let's make a bar graph for different pets like cats, dogs, rabbits, and hamsters, and how many there are of each.
Step 1: Decide on the title, like "Pets at Home".
Step 2: Draw lines up and down and side to side.
Step 3: Put labels on the bottom line.
Step 4: Write "Cat", "Dog", "Rabbit", and "Hamster" on the bottom line.
Step 5: Label the side line with "Number of Pets".
Step 6: Pick how many pets each square means.
Step 7: Finally, draw bars for each type of pet with how many there are.
Introduction:
Double bar graphs are like superhero tools for comparing two things at once. Imagine you have marks from two tests for five students. A double bar graph helps us see, at a glance, which week the students did better.
Key Points:
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1. What is a bar graph? 
2. What constitutes a bar graph? 
3. What are the types of bar graphs? 
4. What are the properties of a bar graph? 
5. What are the advantages and disadvantages of a bar graph? 

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