Bar Graph Worksheets

How to Read Bar Graphs - A bar graph or a bar chart, as we call it today, is perhaps the most common way of demonstrating statistical data. It compares data in the form of bars. A bar graph breaks down data into groups and represents the data in bars of varying lengths. The bar either uses frequency (no. of people) or relative frequency (percentage of each group).

The above bar graph shows the data of American household income ($ thousands) and the money ($ thousands) they spend on their transportation per year. The first bar represents the people having household income $5000, and the amount they spent to commute is 2.5, which is $2,500. This is 50% of the total income. As we move to the right in the graph, the bar that representing $30 to 40K per year spends $6,000, which is Here, we note that as the household income increases, the people spending money on transportation also increases. This makes sense, because as the more people will earn, the more they will have on hand to spend on transportation. Also, note that the groups of people who earn more spend more, but they don’t spend more as a percentage of their income. How to Make Bar Graphs - Just as we draw other forms of graphs, bar graphs are more or less similarly drawn and are pretty easy to construct and analyze. In bar graphs, the first thing that we do is define a key/legend. A key or legend states that how much distance on either of the axes will represent the count of a numeric value 1. For example, on a graph paper, a centimeter box can represent the count of 1 in case we are trying to plot the values of certain variables of an equation. Once we have defined the key, the rest is pretty easy. All we have to do is solving the given equation for the values of its variables and plot the obtained numeric values on the graph. For example, if the coordinates of a point are (2,3), then it means that a vertical bar will be drawn on the x-axis at 2 and reach a height equal to the value 3 on the y-axis.