Mathematical statistics chart, draw a box first, and then divide it with horizontal and vertical lines.

For example, count the boys and girls after work, and fill in the names of each class vertically, such as Class 1, Class 2 and Class 3. There are several classes that write several grids, and the last grid writes the total number; The model writes men and women in the grid. Then fill in the number of men and women in each class at the corresponding intersection, and finally add them up. This simple statistical table is completed.