Statistical charts are images and maps of various geometric figures and things drawn according to statistics. It is intuitive, vivid and concrete. Statistical charts can simplify, popularize and visualize complex statistical data, which makes people clear at a glance and easy to understand and compare. Therefore, statistical charts play an important role in the collation and analysis of statistical data and are widely used. When answering questions about statistical graphs in data analysis and testing, we should not only examine the intuitive image of graphs, but also check the data to avoid being confused by the superficial image.

(1) Bar chart: A bar chart represents a certain quantity with a unit length, draws straight lines with different lengths according to the quantity, and then arranges these straight lines in a certain order. It is easy to see the quantity of various quantities from the bar statistics table.

(2) statistical chart of broken line: statistical chart of broken line represents a certain quantity with unit length, then draws points according to the quantity, and then connects the points with line segments in turn. The broken-line statistical chart can not only show the quantity, but also clearly show the change of the quantity.

(3) Sector statistical chart (optional course): Sector statistical chart represents the total with the whole circle, and the size of each sector in the circle represents the percentage of each part in the total. Through the fan-shaped statistical chart, we can clearly show the relationship between the number of each part and the total.