Histogram is a graph that divides the total distance of the collected measured values or data into several equal intervals with the horizontal axis as the unit, and arranges the area of the measured values in each interval with columns, so we also call it histogram.
Plato arranged a rectangular chart from high to low in order to find the main problems affecting the quality of products, indicating the frequency of each cause. Plato was created by Dr. Zhu Lan, an American quality control master, by expanding the statistical chart of Italian economist Plato, also known as pareto chart.